Auggie is on an appetite stimulant

We don't know why Auggie doesn't eat very much, but we now have him on periactin which is an anti-histamine but also acts as an appetite stimulant.  I mix it in with his yogurt.  He's been getting 1ml twice a day, but I might try increasing it to three times a day. He has increased the amount of solids he eats by about 50% and his drinking by about 20%, so it seems to be working. Now we're just waiting for the extra calories to translate into extra ounces.