Add to baby gear:

Infant Acetaminophen and/or Ibuprofen and a dosing chart from your doctor. They don’t mark the dosage for under 2 years old on the package. It might be hard to “ask your doctor” if you're stranded.

You can never have enough diapers and wipes. Include several sizes from newborn on up, they outgrow them fast and one that's too large is much better than two that are too small.

EXTRA CLOTHES! They WILL have an explosion the one time you leave the house without extra clothes. See above for sizes.