In the last episode of season four Piper found out she was pregnant, they all thought the baby would be a girl.

The first time he used his powers was in the episode "A Witches Tail part 2" where he healed Piper.

Since then we've seen him using his powers a lot without even beeing born, for example he made flowers appear when Piper tried to blow up the Siren, and he switched Piper's and Leo's powers so that Piper had to be a whitelighter and Leo had to be a witch, and pregnant.

Wyatt was born in the episode "The Day the Magic Died".

He has very many powers, and I don't think we've even seen the half of them allready.

He can make a forcefield around himself as a protection, nobody can touch him unless he lets them.