Tips on getting baby to sleep on crib?

Denise

My baby is 3 weeks today and would like to start to introduction him to sleeping on his crib for the first weeks he’s slept either in a bassinet next to me or on my bed when my bf is not here so there will be space for him and I . I haven’t tried to put him in his crib due to cold weather my room gets really cold but I don’t want him getting used to my bed or having to be my side. Or is three weeks still to early?