Agreed with the prior replies. Your surgery was so very recent. I’m guessing you were pretty ill and perhaps under weight going into the surgeries?
By the time I had part one of the surgery I was 89lb, down from 110-115lb. The surgeon wouldn’t reconnect until my weight was at least 110. It was a tough road getting there and I ate high calories for three months because I was determined to get rid of the temporary ostomy ASAP. It definitely can take time to regain weight after all that.
That was 30 years ago. Weight gain is not a problem now! Lol