I will be going back to work when lo is 8 1/2 months. I plan to breast feed at night and in the morning. I do not want to express any more when I go back to work. the HV said that lo could just have water during the day. is this acceptable? she said there was no need for formula? I'm worried lo wont get all she needs from food. I haven't started weaning yet, so have no idea how she will take to it so may have to wait to decide anyway, but would it be better to give her at least one bottle of formula a day? advice please.