I am having my baby on the 14th of November and we did all the baby clothes this week and set up the bedroom for the new baby and my 2 yr old has lost his mind. He says everything is his and refuses to let me put any of the new baby clothes in the empty dresser. He rips them out and throws them everywhere. That is HIS room according to him so I am guessing he is jealous. They get over it though. All of his older siblings went through it too and it is normal behavior. The only time it is not considered normal is when the sibling begins to hurt the new baby and knows they are hurting the baby on purpose. That is when you need to seek help for the sibling.
I thnk some jealousy will be normal. Is the toddler still nursing?
Mine will be 21 months apart when #2 comes and I hope to minimize jealous feelings by including her in taking care of baby and also spending special time with her like the other response said.
Also, I was told that because the older child will be told that they have to wait sometimes while you nurse baby or change a diaper that it is good to tell the baby to wait sometimes. When the toddler wants to play and baby is happy then sit baby in a bouncer or lying in a basinet and say "you need to wait here while mommy builds a castle with <name>." The baby won't know what you are saying but the toddler will feel good about the fact that