FTM looking for advice

Teri

My baby is 3 months old. He will not lift his head off the ground during tummy time. However he does very well with head control when on us and when I sit him up. This is stressing me out. I know developmentally he should be lifting his head on the ground. Side note his head size is greater than the 99th percentile. Anyone else have babies who won't lift their head from the floor? Any advice to help him?