My 8mo baby is breastfed and weaning solids. For half a day a week she goes to her Granny's (to get her used to it before I go back to work). Granny is giving her formula (because for some reason my boobs don't express anything). At the moment we're just sticking a straw into a ready made bottle of aptimal. She's pretty good with a straw and this way there's no worry about washing/sterilising for my mum. But I'm thinking that maybe I need to switch to a Sippy cup or straw cup.
What do you do? And if you use a sippy/straw cup, do you sterilise it?