Previously, my baby wakes up at 10pm, 3am and 5am to drink her milk. But just last week, she doesn't wake up anymore and enjoys sleeping longer hours instead. Is this normal to all babies?

Well, this varies for different babies. You ought to thank baby for your well-deserved sleep. Not all mummies have such a good life. It also depends on the day activities you had with her and the amount of sleep she has in the day. All these factors will determine her sleep at night. I'm breastfeeding my baby and doesn't have such a good life like you. I wakes up every 2-3 hrs even until now that baby is 5 months old.