Hi. Dad here.
My 3.5mo old son has been struggling with what we believe to be MSPI for about a month now (since just after his 2mo check up). It started with a frothy green stool with a little bit of blood in it and a rash/pimples on his cheeks. After visiting with the pediatrician, who referred us to a GI specialist, we were put on Alimentum while my wife worked on the elimination diet. The GI told us to eliminate milk, soy, eggs, beef, and pork. He was gaining weight well at his 2 month check up, though I'm not certain he has continued to gain weight well. On Alimentum, he is generally a very happy baby -- very little spit up, occasional fussing, sleeps through the night.
Our plan was to switch back to breastfeeding and one-by-one introduce foods to her diet to narrow down what he may be allergic to. We tried switching back to breastfeeding at about 3mo, and on his third day, his stool was back to green and full of mucous (though no visible blood). He was very fussy that night, which is almost never is. By the forth day, his stool was nearly all water (diarrhea) and we immediately went back to Alimentum. My wife and I took a closer look at her diet and decided that we were probably not doing a good enough job eliminating milk and soy. Two more weeks later, we tried again. It is now the third night. His diaper today was full of mucous and about an hour ago he started being extremely irritable.
We wife and I both work and we simply don't have time to cook (I don't get home from work until nearly 8PM). We end up eating out a lot. We have found it extremely difficult to find anything at all to eat. My wife now weighs less than when we first met. My questions are:
1. If I continue to feed my son with Alimentum, all the way to 12-18mo, will it increase his changes of becoming permanently allergic to whatever he's allergic to?
2. If I continue to feed my son breastmilk and do a poor job with the elimination diet (meaning, he will still be exposed to some degree to whatever he's allergic to), will it increase his chances of becoming permanently allergic to whatever he's allergic to?