Ds is 5 months and has been exclusively breastfed. Now I want to start leaving him with other people occasionally. He will take ebm from a bottle but not formula. Trouble is I can't express enough to make using ebm practical - took me a whole week to build up enough to leave him with dh for an afternoon! Any tips on how to get him used to formula? Have tried both the first milks and the SMA white type.