The Little Giant

We had planned on getting a crib for my son once we moved into our new house, setting it up and having it ready for him when he got home from the hospital but since my son entered this world way too early, the crib was not even purchased let alone set up. Being as small as he was at birth it ended up not mattering anyhow; he spent the first month or so sleeping in his playpen (and he looked dwarfed in that even). In fact it he was almost a month old when we did finally get him a crib.

Ever since we bought the crib and set it up, the mattress was left at the highest setting. Today that all changed. My son has grown so much in the past eleven months that he would be able to climb out of the crib if he got it in his head to do so. Because of that, we had to move the mattress down today. We put the mattress right to the bottom setting so we will not have to move it again until we have to transform the crib into the next stage. He is still a bit on the small side but he is catching up quickly so when he goes to day care Monday, he should not be bullied around by any of the other babies.

Question: The last sentence above got me thinking about a somewhat silly thought. When does a baby cease to be a baby? All other age groups have clear markers as to when they progress into the successive group but I am unaware of the evolution out of the baby stage. I must admit I have never really given this much thought before but the question now seems relevant.