Need help. My son's step daughter's child is failing to thrive and has from the beginning.

if the baby is doing yellow runny poos its LACTOSE INTOLERANCE
Ironically you still breastfeed them a bit after changing to lactose free formula as breastmilk is so good for them. Also these days you still expose them to milk a little as they grow up and they overcome the intolerance. It really does work
but remember YELLOW RUNNY poos means the lactose intolerance

One of my kids was lactose intolerant and couldn't keep down milk at all but did great on soy formula. Has Peyton tried soy?

yes...I do...

I had to eat a bland diet - went off onions, spices, tomatoes and peppers for about 8 months until my baby was weaned to eat solid foods. Have heard of this from other moms too - perhaps it's something like this, bothering the baby. Best to You.

They don't do MRI for pyloric stenosis. I'm not sure why they would start with an MRI when they have to sedate the baby...which is the last thing they want to do.

They have to see the movement. (or non-movement) of fluid through the pylorus into the duodenum. MRI doesn't show motion. Only ultrasound can show that (upper GI does too but that is X-ray).

Before you try all the above alternative therapies...make sure there is nothing structurally wrong. And they can also test for specific allergies if that is a concern.

[link to www.imagingpathways.health.wa.gov.au]

Possible Milk Protein allergy?? Is he is on Nutramigen? My child is failure to thrive but is finally starting to gain. He did have reflux but grew out of it. He does have milk protein allergy so did my other two boys. Has baby has an ultrasound to rule out pyloric stenosis?? Has doc rec adding rice cereal to bottle?