My LO is also 4.5 months and started this week 🫣
Probably them just realising they have control of theirs heads. My LO has discovered her feet too. It's all fun and games over here lol
It's a sensory thing, they're realising their heads move and the sensation so they continue to repeat the action to understand it more
My 5 months also does it, it’s kind a cute ☺️
I think it's can be soothing for them too. My first used to do it to help her get to sleep and I've noticed this baby has recently started doing it too. It's so cute 🥺
@Ronda mine does it to help her sleep too.
My little girl has just started to do this too
Suddenly stopped doing it I think it was to do with teething pain.
My baby also does this when playing and having nappy changed. This started about a couple weeks ago for me and baby is 4.5 Months x