Size:Small - 4-12 Months, 13-21lbs | Color:Light Pink The INVENTA Sleep Bag is designed for Independent Sleep, STAGE 3 of the Love to Dream Sleep System developed with the goal of helping families achieve longer, better sleep despite the challenges presented by the arrival of a new baby. After progressing through STAGE 1 and 2, one of the biggest concerns remaining for parents as their babies begin to achieve independent sleep is worrying about whether their little one is too hot or too cold during sleep times. Blankets can be kicked off during sleep, causing your child to wake because they are cold and loose blankets can create a dangerous suffocation hazard. Traditional zip-up blanket sleepers on the other hand can cause your child to overheat. The INVENTA Sleep Bag allows you to gently adjust your child's temperature using The Genius Cooling System. Simply open or close the built-in zipper as needed, without waking your child. With the INVENTA, there is no risk of dangerous loose blankets in your baby's crib. The .5 TOG and 1.0 TOG INVENTA products are 100% cotton that is smooth, silky and highly breathable. Extremely gentle on your baby's skin, and very effective at controlling moisture, the INVENTA is the most comfortable baby sleeping bag available. More even temperatures and increased comfort mean more sleep for everyone.