Not too gentle but not too rough! Babies are durable. There is no need to play with your baby as if they were a piece of fine china. Life is full of bumps and bruises so starting off with some “horsing around” will build up the resilience to everyday activities. When your baby falls which– a regular occurrence– comfort them in a reassuring manner but don’t pick them up and coddle them to try to get them to stop crying. THat would create positive reinforcement for crying whenever something undesirable happens. Let common sense dictate.