Once breastfeeding is established and going well (after around 6 weeks) some mums may want to introduce a bottle of expressed milk (or formula) so dad can share in the feeding, to have a rest, for occasional well earned evenings out, or to prepare for returning to work. Some babies will happily take a bottle with no problems but others will be resistant and take a while to get used to a new method of feeding - after all mummy milk is far more appealing to baby than a plastic teat! With patience and a bit of time the vast majority of babies do learn to take milk from a bottle.