Similac® Soy Isomil®

Complete nutrition for sensitive tummies

Comfort your baby's fussiness and gas with Similac Soy Isomil — specially designed with the gentleness of soy to soothe the tummy.

Some issues, such as fussiness and gas, are a common part of feeding your baby. However, if these common feeding issues continue, ask your physician about switching to Similac Soy Isomil.

Soy-based formulas such as Similac Soy Isomil have been clinically shown to help reduce these feeding problems. And no other soy-based formula has been studied more than Isomil®.

Soy formulas are not recommended for premature infants with birth weights of less than 1800 g.
Similac® Soy Isomil®
tummy care guarantee
Parents know that every tiny tummy is unique.

So if your baby's tummy doesn't agree with a Similac product,
you can try another one FREE*

*Refund of purchase price (excluding taxes and shipping) on select products
only. Limit 2 refunds per household. Must redeem within 30 days of purchasing
alternative formula.

Similac now has OptiGRO

OptiGRO is our unique blend of DHA, Lutein and Vitamin E; these important ingredients are found in breast milk.

  • DHA for brain and eye development

  • Lutein to support eye health

  • Vitamin E an important nutrient found in breast milk to support developing cells

OptiGRO is available in most Similac formulas.

Knowing Means Growing™

Formula types

  • Powder formula
  •  |  Ready To Feed formula
Powder formula
Ready To Feed formula

Powder formula

Just add powder formula to water and mix.
Similac® Soy Isomil® SimplePac

Available in the Similac® SimplePac®

Mom Preferred. Similac SimplePac. And chosen easier to use 3 to 1 over the Enfamil® refill tub.*

*Formula Package Study 2010.

Feeding solutions

It takes time for a baby’s digestive system to mature, so a fussy baby
doesn’t have to mean switching formulas. 

Always talk to your pediatrician about feeding issues before making a switch.
Soy formulas are not recommended for premature infants with birth weights of less than 1800 g.

Before switching, try these suggestions:

  • Use a different bottle or nipple.
  • Use a different burping position.
  • Adjust your body position.
  • Use liquid formula instead of powder.

Have more feeding questions?

Go to Feeding Expert 
Keep learning about your baby's development every week
Get nutrition guidance and feeding help delivered right to your inbox.  
Join Similac® StrongMoms® now.   

Your Similac StrongMoms membership is free, and includes:
  • Expert nutrition guidance for your pregnancy
  • Weekly updates on how your baby is developing and growing
  • Up to $329 in membership benefits
Offers may vary.  
Get up to $329† in great offers. Sign up now >

Rated 4.9 out of 5 by 70 reviewers.
Rated 5 out of 5 by My baby love this brand I've tried every other formula and this one is the only one that works August 28, 2015
Rated 5 out of 5 by this product works well for my baby Tommie! When my baby was born she had terrible and very uncomfortable gas from me breastfeeding and supplementing. So, my doctor scheduled us an appointment to see what was really happening. After our visit, he suggested placing her on Isomil soy milk due to my intolerance to regular milk. Since the change, my baby is much more comfortable and the gas did subside. Thank you so much for allowing me the opportunity to rate your product. I give this product a 10! August 28, 2015
Rated 5 out of 5 by soy Soy formula h as decreased spitting up and less stomach upset August 26, 2015
Rated 5 out of 5 by Removing security foil is extremely difficult The formula itself is great. When purchasing a new container and you have to remove the foil lining it is extremely difficult to do. The pull tab rips no matter how "gentle" you pull and then you actually have to put your fingers (touching the powder) inside the container to remove the remaining foil wrap. August 26, 2015
Rated 5 out of 5 by superb! my baby used to spit up alot until i tried soy! a total life saver !! August 26, 2015
Rated 5 out of 5 by Amazing My baby is allergic to the protein in the milk and was throwing up alot. Dr put her on soy she loves it. I tried giving her another brand to seenif she liked it and she threw bottle down. Also Dr asked if she was constipated since soy tends to have this effect on babies and im glad to say that not at all. August 26, 2015
Rated 5 out of 5 by All three of my boys grew up on this formula Each of my boys were born with minor issues that somehow affected their tummies. Isomil was the only formula they were able to tolerate and keep down. I have recommended this product to several new mommies or mommies-to-be. With one boy in college, one in middle school and now a 9th month old, I can definitely say I have had excellent results with this formula and would trust no other brand. Thank you Similac. August 26, 2015
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