My son is 6 months now, my milk dried up when he was 3 weeks, I went back to work too early and didn’t have enough time to pump like I should have. I’m expecting another baby, my baby will be a year old when this baby is born. When I did breastfeed I produced so much I had a 3 month supply (threw a lot more away after it sat in the freezer for a few months) If I produce like last time would it be okay to give my 1 y/o breast milk also? Will the switch hurt his belly any?