But back to how products change. When my youngest was a baby (almost 5 years ago), you just put them to bed in their little sleeper. Sometime after she turned about 1 or 2, sleep sacks became very popular. I do see the point of them: less clutter in the bed to suffocate under like blankets. The way my kiddos sleep, I wonder if they would roast; my children hate socks and blankets over the feet thanks to their dad's sweaty, hot feet. Anyhow, said friend is baking her baby as we speak so I took the time to whip up another custom gift: a sleep sack and sweet hat!