Just to reinforce that everything is probably alright-
My baby was-
11 lbs 1 oz and 21.5 inches at birth
15 lbs 14 oz and 25.5 inches at 2 months
And 21 lbs 7 oz and 31.8 inches at 6 months
Because my baby didn't immediately gain back the weight he lost after birth, my peditrician at the time had me in a panic and told me my baby was going to end up in the hospital. He also wrote "failure to thrive" on his chart and told me to stop breastfeeding him. Breastfeeding was something I personally decided was best for my child so I was devistated.
I was a new mom and my hormones were still alittle wonky. I cried and cried and thought I was a failure and that somehow my baby was hurt and it was my fault.
After some research and reflextion, I decided to not follow his instructions and switched to a different pediatrican in the same office. A few visit's later we were in the office for a regular check up. The new doctor was looking in the chart and said, "That…..um…..failure……to thrive……….diagnosis (insert really long pause) was probably because he didn't gain all his weight back after a week? I mean it's not THAT big of a deal…." The new doctor looked perplexed. He obviously had a thriving baby in front of him who is probably the biggest baby he's seen in awhile.
I don't have a fat baby. I have a big, tall, healthy, happy baby. It sounds like you have a big, tall, healthy happy baby too.