I return to work next wk as a teacher and my mil is looking after ds, 30wks. He is bf and eating three times a day. Mil is v pro bf and wants to bring him up in my lunch for feed. I am not keen as have 30mins and think will be v stressful. Ds never took to expressing, bottles or formula. He drinks water from a cup. Should I leave ds and mil with some formula in a cup or some cows milk (gc mentioned this)? And then of course feed in the morn, after work and eve. Hv said may want to consider vitamins for baby as well. What do people think?