My DS is 7 weeks and was born at 37 weeks. I was aware babies start socially smiling around 6 weeks. Saw the health visitor today who seemed a little concerned he hadn’t started smiling yet. Said to give him a couple more weeks ‘before we start to worry’. Surely it’s reasonable to expect a baby that was born early to be slightly behind at this early stage? Would love to know when others’ LOs started to smile?