Yes! Thank you. The show's going to end soon anyway. It's the perfect time to add a baby or two.
And like TVFAN mentioned in one of the posts above, they are all in their 30s, 2 married couples, a couple in a serious relationship and well, Raj... Having a baby is a natural progression (for some, I know it's not for everybody). They can't hold it off any longer.
Oh and yay! Emily's gone! WOOHOO!