http://www.sikhitothemax.com/page.asp?ShabadID=184
Tell me one thing, Do you remember how it was like in your mothers womb?
Bani tells us that the mothers womb is like a pit of fire.. like hell, and that even there he looked after us. and thats where our knowledge needs to stop. Why? Because if it wasn't for our desires and our greed, we wouldnt be born in the first place.
The fact that we are born, and we are lost... is why we need bani or any other religion to guide us, enlighten us on issues which we are unaware about because we are so engrossed in maya and so that we can rectify ourselves.
The reason the child is closest to parmatama in the womb is because they are untouched by maya and can concentrate on bhagti. This explains why a child begins to cry as soon as they leave the womb and enter the world, they are lured by maya, they cry in pain of separation from parmatama. But as the child grows older, they are more and more attracted to maya slowly forgetting why they came here in the first place, by the time they realise its too late as all we're left with is old age. The shabad above explains all.
We dont need to know about our past lifes... we're already born! Now just work on fixing it.