They grow up so fast!

I know this is off topic, but I also know that almost all of you are moms and will sympathize.
The day before we left on vacation, Sierra climbed out of her crib. ("How did you get out of your crib?" "I don't know." "Owen, how did Sierra get out of her crib?" "I teached her!") She then proceeded to climb in and out of it for the next few days and managed to hurt her back doing it. Ok, Sierra, no more crib for you -- it's dangerous! So we bought her a big girl mattress and put it on the floor. Today is her first night in the big mattress. She looks so little in there.... I spent the afternoon rearranging the furniture in the room so I could fit the mattress in. Steve said he thought that I would just take the crib apart and I know I should have.... Just thinking about it made me cry. My baby is not a baby any more. sniff, sniff,... Is it wrong to want to leave the crib in her room?