My little girl is 20.5 weeks (4.5 months old) and I am worried about her development. I am a FTM so may just be anxious but so far she hasn't rolled front to back yet. She has bad reflux so we don't do a lot of tummy time. She has excellent head support when being held up right and rolls side to side and cranes her neck round to see what is above, but no rolling yet.
She also doesn't babble. When she was about 3 months old she started making a 'mmm' sound almost constantly and did this for about a month, but now it has stopped. She hasn't made any other vowel sounds, but oohs and ahhs and 'shouts' a lot.
She smiles regularly but has only laughed about 4 times since her first laugh about 6 weeks ago.
She is grasping items and scratching/ stroking materials.
Should I be worried, or is this normal?