1 - Our crib will convert to a toddler bed, but we'll be using the crib in a few months for baby sister.
2 - We would still have to buy a new mattress to fit in a toddler bed since the crib mattress will be in use.
3 - Sammy has the potential to be quite tall and thus grow out of the toddler bed quickly.
4 - Why spend money on a toddler bed that he'll grow out of when we can spend the money on a twin bed he can use until he's 16 (or older).
5 - We didn't want Sammy to feel like he'd been pushed out of his bed when Baby arrives.
I was SUPER nervous about him actually sleeping in the new bed because:
1 - There's no longer a way to contain him at nap time
2 - He might/will fall out of it
We set up the new bed while Sammy watched us from his crib. I wanted to leave the crib up so that if the new bed was a disaster, Sammy would still be able to sleep in the crib. The entire time we were putting the new bed together, Sammy would point at the bed and say "Nigh, nigh."
When we finished, we got him out of his crib and he walked right over to the new bed, laid his head on it and said, "Nigh, nigh." We then got him ready for bed and put him down in it. We didn't hear a peep from him all night!!!
Nap time the next day was the same way. I laid him down and walked out of the room. 3 hours later, he woke up! He rarely slept that well in the crib.
He hasn't fallen out of bed (yet)...although he did fall OFF his bed the other day when he was standing on it and backed up. I'm also happy to report that today was the first time I've had to go back in his room during nap time to lay him down again - NOTE TO SELF: clean up the toys before putting Sam down for his nap. They are just too enticing for a 20 month old who wants to play all the time.
Hooray for Big Boy Beds! (and for big boys who stay in and sleep well in them!)