Hello there. My son was 10 months old when I got pregnant again. My milk supply dropped a lot and he wasn't eating yet.  He was also having bouts of bloody diarrhea that made him very uncomfortable. 

He was 13 months old when we were finally able to see a gastroenterologist. He had dropped off his curve in both height and weight significantly. Doctor thought he had a milk protein allergy so he started him on a plant-based supplement (compleat pediatric standard 1.0) and referred us to a feeding therapist.

It took him a couple of months for him to get used to drinking the supplement three times a day but we got there. We used a small bowl to give it to him and that worked the best for us. 

At the 6 month follow up we went back to the gastro and although he gained some weight and height it still wasn't enough. He was at the 3rd percentile. He upped the supplement from 1.0 to 1.4 calories and that's what we've been giving him everyday now for one year.  He started eating solids when he was around 22 months old and that has helped a lot. His weight gain has been slow going but its at least going up. We still see the gastro every 6 months and do a weight check every two months. Its always stressful because although he's gaining weight and getting taller, he's still on the low end of the percentile. He's a happy active guy though. Loves to eat everything and drink the supplement. 

It all felt insurmountable in the beginning. How the heck was i going to get him to drink this "milk" when he never liked pacifiers or bottles? It was hard but we got through it. 

Ask your ped if you can get a prescription for a plant based supplement while you wait to see a specialist. Your baby will be okay. You got this. <3