HI Jasmyn, If you eliminate some situations in their environment that make them aggressive they may settle down. Are they spayed? Intact kittens can be a bit aggressive. I know many people still believe you have to wait until kitties are 6 months old but they can go into heat as early 4 months. Are they food aggressive? You can separate their food bowls so they won’t feel threatened. I hope this helps you and your fur babies. PG FYI – This is a good time to learn how to trim their claws. Here’s a link on how to do that – http://www.catscratching.com/htmls/article.htm If you’re not confident you can do this, ask your vet to show you how to do it.