You need to specify what the three year old is. Humans cannot reproduce at that age, but many other animals can.
No
A female can give birth when she is three for four years old.
i am 9 year old child and if you are too no one is able to give birth this is kind of crazy !
yes, if she has a period.
Yes it is.
yes
Ugly
Yes, mothering is instinct in rabbits.
Nothing. A three year old always acts like that. You should talk to your doctor if you are really concerned.
Female tigers (tigresses), including the Bengal tigresses, usually have their first litter at three years old.
No. It is genetically impossible for human males to become pregnant or give birth.
If she has her period and had sex and got pregnant - although that wouldn't be an ideal circumstance.