ergoPouchergoPouch Baby Sleep Sack 1.0 TOG, Sleep Suit, Cozy Transition from Swaddle, Ideal for Nighttime Temperature Control, Unisex (2-12 Months, Mountains)

I love the quality, as well as the utility, of this item. You can zip it into legs so your baby is warm and snug in the stroller, or if he/she just likes to kick around a lot and wants more freedom than the sleeping bag shape provides. Cute designs, holds up after washes, and my baby had plenty of time to grow into it. I bought the lighter and heavier versions as well, and now have these for all occasions. I like the short sleeve one the best, it is most versatile with clothes underneath, and is the best TOG/temperature for layering in our moderate climate.