I don't follow Lost at all, though I understand the timeline's a mess. For example, this baby-equipped Dharma Initiative logo merchandise on CafePress seems like it's from about two years ago.
On the bright side, the design is being called "baby hatch," which, well.
LOST baby hatch maternity t-shirt, $25 [cafepress via boingboing]
I should buy this for my wife strictly on the premise that she wouldn't get the joke.