is my son a normal weight?

he was born 7 pounds 8oz at 37 weeks. now he’s 4 months old at 12 pounds 2oz and 25 inches tall. is this okay? he’s not sitting up unassisted or rolling over. he does tummy time literally all day. not giggling but he smiles fine. he’s breastfed.

my pediatrician says he’s okay but she also questioned if i give him whole milk... like, what?