Reply to First child’s birthday party right after sibling’s birth?

Do something small, you can even do it at a pizza place so you don’t have to do any of the decoration and clean-up. As long as you celebrate & give your toddler some well deserved attention, specially with a new baby on the way, that’s all that matters. When my little one was born, we made sure to give my toddler son extra attention & random little (and inexpensive) gifts just so he didn’t feel left out, unloved or jealous. Best of luck and congrats on the new bb.