A close-up of a mother's hand gently cradling a newborn's foot, conveying warmth and care.

How I Knew My Baby Had MSPI

ByMarisa

(Milk Soy Protein Intolerance — and What I Wish I Knew Sooner)

When my daughter was just a few weeks old, I could tell something wasn’t right.

She was fussy. Not “just a little gassy” fussy—more like red-faced screaming for hours, every night. She arched her back, kicked her legs wildly, and barely slept unless I held her upright. Everyone told me it was colic or that she’d “grow out of it.”

But deep down, I knew something else was going on.

The Symptoms We Saw

Here’s what my baby showed—classic MSPI signs that I didn’t recognize at the time:

  • Mucus in her poop
  • Screaming during and after feeds
  • Waking constantly at night
  • Severe gas and grunting during sleep
  • Rashes on her cheeks and torso
  • Low weight gain despite frequent nursing
  • Frequent spit-up or reflux-like symptoms

These are not just reflux or “normal baby things.”

What Is MSPI?

Milk Soy Protein Intolerance (MSPI) is a non-IgE mediated immune reaction to proteins, most commonly to cow’s milk protein and soy protein. Unlike a true allergy, it’s not an immediate, severe allergic reaction, but rather a delayed response that can affect multiple body systems (like the gut, skin, and respiratory system). MSPI can happen whether your baby is breastfed or formula-fed—because these proteins can pass into breastmilk.

What Finally Made It Click

After multiple pediatrician visits, trial formulas, and being told she was “just sensitive,” I found a support group online where moms described exactly what we were going through.

I cut out all dairy and soy from my diet for 2 weeks—and the change was shocking:

  • Her poop normalized
  • Her face cleared up
  • She slept longer than 30 minutes at a time
  • She smiled more

MSPI wasn’t just a possibility—it was the answer we were looking for.

How to Get Help

If you think your baby might have MSPI, here are some steps that helped me:

  • Talk to your pediatrician. Ask about an elimination diet or allergy referral.
  • Keep a food + symptom journal. Track what you eat, baby’s behavior, and diaper output.
  • Eliminate all dairy and soy. Hidden dairy and soy can be sneaky—look for whey, casein, butterfat, soy lecithin, textured vegetable protein, etc.

What I Wish I Had from Day 1

I created Milk Free Mama to help other parents feel less lost.

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