My daughter had something like that when she was a newborn. Checked with her PD and was assured that it’s normal and should go away by 3 mo. It did and she’s totally fine now.
I remember stretching is normal. My girl stretch a lot when she is a newborn. My friend said her mum say they get taller this way. 🤣
Why not look for a paediatrician? They knows more than polyclinic doc as they are more specialised with babies.
Don’t worry. Stretching is absolutely normal. My baby also stretches a lot when she was just born.
Zennevia Chow Jiaxuan