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An Allergic Reaction to Infant Formula? Symptoms to Look For

Updated on July 7, 2015
Chris Telden profile image

Living with food allergies - both her own and her family's - has driven Chris Telden's lifelong interest in diet, health and cooking.

If food allergies run in either parent's family, you may be concerned that your baby is displaying symptoms of an allergy to infant formula. Although allergies to baby formula are uncommon - the U.S. Department of Agriculture puts the number of babies who develop an allergy to milk protein, the base of most infant formula, at less than 3 percent of U.S. infants - some babies do develop them. Half of those that have allergic reactions to milk-based baby formula are also allergic to soy, which is the other main food base of infant formula. If your baby does have signs of an allergy to milk formula, talk to your baby's doctor.

In the case a food reaction in an infant, allergy treatment usually means changing the food the baby is eating - in this case, the milk. There are hypoallergenic formula options that may help. Here are some symptoms of infant formula allergy to look for. Oh - and if it turns out your baby is having an allergic reaction to infant formula, don't stress it - within a few years, most children grow out of infant cow's milk allergies.

Skin Rash - a Symptom of a Possible Allergy

In babies, an allergic reaction to infant formula often occurs on the skin. Look for

  • hives
  • eczema (flaky, dry patches on the skin)
  • ring around the rectum that diaper rash cream doesn't help
  • other rash

Baby Vomiting After Formula? May Be an Allergy

Expect your baby to spit up sometimes, particularly in the early months.  Babies have immature digestive tracts and normally spit up occasionally.  But take note if your baby is:

  • having repeated vomiting episodes
  • having episodes of forceful vomiting (projectile vomiting)
  • spitting up formula a lot, an indication that your baby may have excessive reflux

Baby Has Diarrhea? Constipation? These Could Be Allergy Symptoms

Your baby's stools may indicate an allergy to cow's milk protein or soy.  Note if the stools:

  • smell foul
  • are unusually hard (constipation)
  • are unusually loose (diarrhea)
  • are frequently loose (diarrhea occurring multiple times in a day for several days) - CALL THE DOCTOR
  • blood in the stool - CALL THE DOCTOR

Note: it's normal for a baby's poop to change appearance and smell when you switch from breast milk to infant formula.

Tummy Hurts? Could Be an Allergy Symptom

Abdominal discomfort - that is, tummy pain - can be a sign of an allergy to infant formula. Watch for these symptoms:

  • Your baby fusses, cries, and squirms during or after a feeding
  • Your baby cries a lot, seems gassy, or shows other signs of colic

The symptoms may, however, not be indicative of a baby formula allergy at all, but again be due to the baby's immature digestive tract or some other problem.

Note: Lactose intolerance, while possible, is actually quite uncommon in babies, according to the U.S. Dept. of Agriculture.

Poll: Does Your Baby Tolerate Hypoallergenic Formula or Soy-Based Formula?

If your baby is on a special infant formula due to allergies, how is he or she doing?

See results

Breathing Difficulties Could Suggest a Baby Formula Allergy

An allergic reaction to milk protein may be indicated by these symptoms if they present when your baby does not have a cold virus:

  • nasal congestion
  • wheezing / asthma
  • shortness of breath
  • throat mucus
  • nose mucus
  • other breathing problems or abnormalities of the respiratory passages

Baby Losing Weight? Gaining excessively?

As a result of other symptoms, in particular excessive vomiting or frequent diarrhea, your baby's growth may slow down.

Watch for this sign of a possible food allergy. If you suspect failure to thrive, don't hesitate--talk to your baby's pediatrician right away.

Also let your physician know if you're concerned your baby is gaining too much weight--not so your doctor can put your baby on a diet, but to see if there is an underlying allergy or condition.

Baby Not Sleeping Well?

An infant formula allergy can manifest itself in part in discomfort that may keep a baby from sleeping soundly.

If your baby shows any of the above symptoms and you are concerned that she is allergic to infant formula or might have another health problem, talk to her pediatrician.

Don't let this article serve as medical advice--it's just meant as a guideline to help you know what to look for if you're concerned about a possible allergic reaction to infant formula.

Have You Had Experience With Infant Allergies? Comment Here.

Submit a Comment

  • OTmommy profile image

    OTmommy 8 years ago from Southern USA

    Great hub, and so thorough! Both of my children have extensive food allergies including dairy and soy. I chose to exclusively breastfeed after I tried formula once, and my daughter had an anaphylatic reaction to Nutramagin, a hypoallergenic hydrolyzed formula, that still contains the milk protein casein. Now as a toddler, my son drinks a hemp beverage or rice milk. I make sure my kids get calcium in other ways since they can't consume dairy products. Although food allergies are not super common, they are scary to the parents and caregivers!

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