Around 22 weeks I started getting the nesty feelings...
If you have the room, then get it organised early i reckon. Our biggest hurdle is lack of space, so most things are on layby. So we've still "bought" them, they're just not taking up space.
There's a lot to think about and organise: clothes, furniture, nappies (esp. if you're doing cloth), not to mention PRAMS - have you looked at the variety to choose from???? That took us a month in itself!
Bookmarks