Hi everyone. I have a question or need experiences about this situation, etc. So my niece is 10 months old, she’s 2 months behind my daughter. I know all babies are different so I don’t expect her to be anything like my kid, but I feel like there’s definitely something wrong. First off, she’s 35 lbs. yes 35 lbs, my daughter is on the smaller side, she’s only 18 lbs, how is she almost 2 times her weight. She barely sits up at times, she can’t hold weight on her legs, nor does she crawl, she barely even holds her bottle. I’m just concerned, my brother isn’t as active in her life because the mom has her own problems I’ve tried to help because I see it. But she says her doctor says the baby is completely fine and normal. Has anyone else baby been like this? What can I do to help? Any relatable experiences? Also she drinks cows milk already and has been for about 4 months