Talk about what is happening in the family unit, why mommy's belly is getting so big or why there is new furniture coming into the house, maybe even into their room. Take them along to prenatal doctor visits and let them hear the baby's heartbeat. Include them on simple decision making, like deciding between two names for baby or minor decorating decisions in the nursery. When a new baby is about to enter the family, it raises serious concerns within a child of any age. He or she may feel threatened, afraid that mommy and daddy may not love them or have time for them anymore.
Some children feel resentment towards the new baby to the point of wanting to cause the baby harm.
Toddlers may revert back to wanting a bottle if they have given it up, or, if they're potty-trained, may want to again wear a diaper. Other young children may talk like a baby for attention. This is all normal regressive behavior. If it goes on too long, or becomes a major concern to you, talk with your pediatrician for professional advice on how to best handle the situation. Older siblings can feel left out or not important when they see the baby getting all the gifts and attention.