Well, for all those who had girls first and then had a boy here are some things you should watch out for.
10. Big sisters will fight with each other over who their baby brother likes the most.
9. Big sisters will constantly be loving on and kissing and cuddling their baby brother.
8. Big sisters will always be trying to pick up their baby brother even though he might be half their size.
7. Big sisters will try to change their baby brothers diaper and not tell anyone.
6. Big sisters will feed their baby brother a sour patch kid when mom's not looking.
5. Big sisters will open their baby brother's bottle just to see if they can do it.
4. Big sisters will go "shopping" in their room for stuff they don't like, want, or play with anymore to give to their baby brother for his birthday.
3. Big sisters will from time to time get fed up with their baby brother getting into their stuff, but will still think he's the cutest thing ever.
2. Big sisters will teach their baby brother all the things you don't want them to learn.
and the # 1 thing big sister will do to their baby brother is....