DS is 10 weeks old and happy and healthy, no health considerations etc. I know the 'rule' is that baby should be wearing one more layer than me. Up to now I've always dressed him in a vest and then long sleeved baby gro or little trousers and top. But do I always have to put a vest underneath? Is there a reason babieshave to wear them? Could I for example put him in a baby gro and then a cardigan on top to make the two layers? I have lots of hand-knitted cardigans we got given when he was born and he's not getting to wear them at the moment.
TIA