My son is 4 weeks old, I have no need to give him a bottle yet (I am breastfeeding), but I am curious to when you started your babies on bottles?

I am a nanny so when I go back to work, he will be coming with me, so pumping/bottle feeding will be only for when I'm away from him which I don't see in the near future. But someone suggested to help with sleep to pump and have my husband bottle feed him.

My only concern is that I've heard giving babies bottles too early can cause baby-induced-early-weaning which I really don't want to happen. Has anyone had this happen to them?