I would buy a toddler bed for the older one, and use the better mattress for it. Since the older child is heavier, she will need more support than an infant. So for example, if the crib has a great mattress, use that on the toddler bed, and get a cheapie 29.00 to go in the crib.
I would also use the toddler bed as long as possible. Get one with minimal " surroundings" meaning don't get the one we had, with a castle shaped headboard and a footboard you could sit on. It was too long( as long as a twin bed) and took up too much room .
If you child is small, I would keep the toddler bed until at least kindergarten.
another thing you can do is check Ikea - they have some interesting beds. we got a short loft bed. It's like a bunk bed, only NO bottom bunk, and it's way lower than a bunk bed. Under neath it the kids can get under there and play, spread out thier barbies, pollys ect. So they still have floor space to play, and a bed.
Also- I'm not sure if I would keep an infant in with my toddler, or with myself. Everyone needs thier sleep. Wouldn't an infant waking up at night, wake your older child too?? I try to think what I would do if I had an infant now, with my house set up, and I think I'd put a portable crib or pack and play in the hallway. just so when baby cries, she wouldn't wake anyone but me. just a thought.
