How do you handle pumping if going out for a while? I presume you want to breastfeed the baby before you go out. but let's say the baby was fed a bottle sometime before you return. do you pump at all to make up for the missed nursing, if it's past the time when you've`already established your milk supply? if so, when do you do that pumping if baby feeds on demand and you're not sure when they'll feed again? or ok to just let it slide?