I've had this baby for about two weeks now and I've had him on esbilac powder formula. He got pneumonia so i put him on antibiotics, which gave him diarrhea. I then started giving him pedilyte first, then feeding formula. He hasn't been gaining weight really. What Can I give him to stop diarrhea and help him gain weight? Will yogurt help? I read it restores natural bacteria and is good for helping diarrhea.