Normal progress for a 4 month old

Hi there. Just wanna check on LO progress at 4 months old. My LO is able to turn but still not able to pull her hand out. Is this normal for 4 months old? My MIL keep comparing her to her grand niece who can turn by herself and hold her own milk bottle. Its stressing me out because she keep saying that my LO is not strong enough because I did not feed her breastmilk but I feel that my LO progress are on track and the grandniece of my MIL is fast.