Ladies I'm nervous. We took kyson to his follow up check up from his surgery, he hasn't gained…

Ladies I'm nervous. We took kyson to his follow up check up from his surgery, he hasn't gained anything in a week, they said his head is big and they r hoping his body will catch up with his head. He's still small. I'm hoping nothing is seriously wrong with him. But on a better note he is eating almost 6 oz. He hasn't thrown up, he poops a lot! And less gassy.