Make sure you know location of diapers, wet tissues, milk, bottles and method of warming milk and extra clothes. Check diaper regularly, especially if they start grunting or screwing up their face. Usually they’ll pong straight away. Get them to drink water regularly (they don’t have the habit yet) and see if they want warm milk every couple of hours. A bath is entertaining but be prepared for more prep with towel, more clothes and talcum powder and whatever. And weather permitting they might not want to stay wet for long.