Try getting in the bath together
This is great opportunity for skin to skin, and to hold your baby close whilst relaxing in the water. Babies come from being in warm water in the womb and recreating this feeling can have a calming influence.
If breastfeeding, being in a bath can help with milk flow too, don't be surprised if your breasts start leaking. Go with it and feed your baby in there too, enjoy the feeling of being calm and relaxed.
This is also a great opportunity for dads to have some skin to skin time too, or, if you have a big enough bath, all of you to enjoy!