Nope, every baby is different. A baby's meant to double their birth weight in the first 3 months anyhow.
Caitlyn was 7lbs 14oz at birth and is now 14lbs 6oz...up until four weeks ago she was putting on nearly a lb a week. Her weight gain has slowed now [as she's refusing her milk

]
So long as he's putting on weight it's all fine
