Re: Support needed :(
with the PPs. Your mom and your DH need to get over themselves and remember that it's not all about them, it's all about the baby. Their job is to support you so you can care for your newborn.
Do you keep formula in the house "for an emergency"? If so, I suggest donating it to a food pantry- they can always use it. And if the temptation is removed, your mom and DH may push less for bottles.
Don't worry about your older children being neglected. The time around the birth of a sibling is turbulent, but in the end the gift of another sibling outweighs any temporary craziness. Can you involve them in baby care? Have them bring you diapers, have them be "in charge" of wipes or pacifiers (if you're using them).
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"