Hilaria Baldwin is considering having a fifth child.

The 34-year-old health and wellness expert already has Carmen, five, Rafael, three, Leonardo, two, and three-month-old Romeo with her husband and actor Alec Baldwin, and although she previously claimed she was happy with four in her brood, she's now toying with the idea of having one more.

She said: ''I've said, 'Yes, I'm done'. But if I'm honest, I don't know.''

The brunette beauty says the biggest factor making her consider a fifth child is her daughter Carmen, who really wants a little sister to help her take on her three brothers.

Hilaria added: ''She wants a sister, because I have three boys. We'll see!''

For now though, the 'Living Clearly Method' author is happy living a bump-free life.

Speaking to Us Weekly, she said: ''People who say that pregnancy is the best time in their life, I think, 'How uncomfortable is the rest of your life!?'''

This isn't the first time Hilaria has spoken about the possibility of expanding her brood with 60-year-old Alec, who also has 22-year-old daughter Ireland from his previous relationship with Kim Basinger.

She said previously: ''I have a daughter and then I have three boys. And my daughter is very sure that she is going to have a sister.

''She does have a sister - she has Ireland, and Ireland is so wonderful and they have a great relationship. But there's something about a little sister that she really wants.''

And when asked if 'Boss Baby' star Alec is on board with the idea of another child, Hilaria thinks it's ''very possible''.

She said: ''I think it's possible. Not [for sure]. Alec thinks it's very possible. He comes from a big family.''