Thursday, May 29, 2014

Dr. Shawna Silver answers your questions



A few weeks back we asked our customers to send in their questions that they had for Dr. Shawna Silver, Paediatrician with Sick Kids hospital. Here are the responses.
 

1. What are the best first solid foods to introduce to your baby? There are so many conflicting opinions out there - allergens, meat, cereal, etc. I prefer NOT to feed my baby cereal because I like to stick with 'real' food, so I've been making and pureeing things like beef stew, chicken, tilapia, eggs. How can I ensure she's getting enough iron, and which foods are healthiest for her? Are there any vegetables or fruits I should be avoiding at this point? I've only given her a couple fruits because I want her to accept vegetables into her diet first.

There are many considerations when starting to introduce solid foods to your daughter.  No matter what foods you introduce, you want to make the experience enjoyable for her.  At six months or so, the purpose of solid foods is to get iron-rich foods into the diet and to start introducing her to different tastes and textures.  She won’t be taking enough solids for them to be a large proportion of her nutrition.  Iron rich foods include meats, meat alternatives (eggs, tofu and legumes) and iron-fortified infant cereals.  All of these would be good options for your daughter.  Not only are fruits sweeter but they also have a stronger flavor than vegetables.  That is why some families choose to introduce vegetables before fruits.  The texture of the food is also very important.  New feeders still have a strong gag reflex and can choke easily.  Their first foods should be very smooth and almost dribble off the spoon.  As they get more used to this texture, foods can be made thicker and then eventually more lumpy.  It will be very important over time to get your daughter to try different textures, but only when she is ready.  No matter what you choose, have fun and don’t sweat about the mess!

The AboutKidsHealth website features a handy guide to introducing solid foods to your infant that you can print and have in the kitchen to give you some ideas during meal preparation.   

2. When it comes to starting infants on solid foods, I have been lead to believe there are two schools of thought. One camp seems to feel that waiting until at least 6 mos of age and then gradually introducing certain foods will help prevent common food allergies from developing and the other which argues for an earlier introduction in order to prevent the same issue.
Do you have an opinion on this topic and can you discuss if from a medical standpoint there is a role for probiotics in an infants diet?

You are correct – there were two schools of thought.  Initially, food introduction guidelines created by the United States, Europe, Australia and Canada, suggested delaying solid foods, especially highly allergenic foods, beyond six months of age in order to prevent allergy.  However, recently, the United States, Europe and Australia have changed their advice on food introduction in high-risk infants and dietary exposures during pregnancy, lactation and early infancy.  A high-risk infant is considered an infant who has at least one parent or sibling with an allergic condition such as eczema, food allergy, asthma or allergic rhinitis.  This new advice can also be applied to infants not at high risk for food allergy.

In terms of maternal diet and breastfeeding, avoiding allergenic foods such as milk, egg or peanut does not prevent allergy and puts mom at risk of undernutrition. Breastfeeding duration seems to have more of an impact on allergy reduction than exclusive breastfeeding for the first six months.  Introducing solid foods at or around six months of age improves iron stores and is associated with decreased rates of allergic conditions.

In terms of the introduction of solid foods, preliminary evidence is suggesting that delaying certain foods does not prevent allergy and may actually promote the development of food allergy and other allergic conditions.  Different studies looking into early versus late introduction of wheat, eggs, fish and peanuts have found that delaying introduction of these foods was associated with a higher risk of allergic disease.  However, more research is needed on the early introduction (less than six months) of specific foods to prevent allergy.  Uncertainty will remain about early introduction until additional studies are completed.  Therefore, do not delay the introduction of any specific solid food beyond six months of age.

Probiotics are live micro-organisms that can be beneficial when consumed in adequate amounts and in specific situations.  Probiotics can modify the gut microflora by enhancing the gut barrier, producing anti-toxins and likely have a role in the immune system.  Different probiotic strains have different biological activities.  Probiotics have been studied for the prevention of atopic and allergic diseases.

One theory suggests that increased permeability in the gut barrier may contribute to higher rates of food allergies.  Lower counts of specific ‘good’ bacteria have been found in the guts of children with eczema than children without eczema.  In some studies, treating children with eczema with lactobacilli has improved their gut barrier.  However, while the gut barrier improves, these studies and others have failed to show that giving probiotics prevents allergic disease or food hypersensitivity.

If you are considering using probiotics, ensure that you are using the appropriate strain studied for the specific disease.

3. My son is 22 months old - turning 2 in June. At 15 months of age we stopped giving him homogenized milk from a bottle after learning it was bad for his teeth. He used to love drinking milkfrom a bottle, but since we've switched to cup, he won't drink it at all. We've tried all different types of cups. I'm concerned he's not getting enough calcium. He does like milk in cereal, yogurt, and cheese. What can I do to get him to start drinking milk? Should I be concerned?

According to the Canada Food Guide, children 2-3 years of age need 2 servings of milk and alternatives every day in order to get their required calcium.  A serving would be a cup of yogurt or an ounce of cheese (one adult finger).  You can offer a serving in a smoothie or milk popsicles.  You can try adding milk, fortified soy beverages or skim milk powder to other foods you are making such as cereals, soups or casseroles.  It sounds like he is getting enough through the other foods he is eating.

If you are still concerned, you can try changing the temperature of the milk in the cup.  Perhaps he prefers it warmer or cooler.  You can also try using a cup with a straw.  Will he drink other fluids with a cup?  Cup skills are essential so it will be very important that he learns how to do this over time.

Here are some examples of serving sizes for milk alternatives from the AboutKidsHealth website.   

4. My 21 month old son was always been a wonderful eater. Suddenly the last couple of weeks he has become a very picky eater. He has been refusing meals without taking any bites (just looks at it & shakes his head), refusing past favourites items & even refusing snacks that he used to love. I'm at a total lost! I've run out of ideas to get him to eat. He's basically living only on whole milk right now for all three meals. Help!

As an infant grows into a toddler, their weight gain slows down and there is a decrease in appetite.  At the same time, toddlers are trying to develop a sense of autonomy.  They prefer self-feeding and become more ‘selective’ (or picky!) in their choice of foods.  If they feel too much pressure, they may resist eating as their way of trying to assert their need for autonomy.  Food intake may fluctuate considerably from day to day.  As long as they are able to maintain stable growth, then you should not be concerned. 

Toddler’s food preferences are unpredictable.  Their favourite food one day will end up being thrown on the floor the next day.  It is not uncommon for toddlers to eat the same 1 or 2 favourite foods and nothing else for a few weeks and then switch to totally different foods.  The important part is for you to continue offering healthy food choices and accept that his appetite and food preferences change considerably over time.  If healthy food choices are always being offered, he will make sure that he is getting enough nutrients over time, even if it does not feel that way for you on a day to day basis. 

Mealtime should be an enjoyable and pleasurable experience.  Toddlers value the company of their family at mealtimes and a family meal gives the toddler the opportunity to learn through imitation.  According to the Canadian Pediatric Society, “A toddler’s time at the table should generally be limited to 20 minutes.  When mealtime is over, all food should be removed and only be offered again at the next planned meal or snack.  It is unlikely that the subsequent meal will be refused”.  Your son may have learned that if he refuses his food, he will get milk which tastes good and fills him up quickly.  Too much milk may suppress his appetite which may impact the next snack or meal.  I would suggest no longer offering him milk after he has refused a meal or snack.  This is much harder to do at the moment but as long as your son is growing well, he is getting enough to eat.

Here is some more information from the AboutKidsHealth website on appetite slumps in toddlers.   http://www.aboutkidshealth.ca/En/HealthAZ/HealthandWellness/Nutrition/Pages/Appetite-Slump-in-Toddlers.aspx.

Thank you everyone who took the opportunity to speak with Dr. Shawna Silver.


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