4 Season® Ultimate Baby Sleep Bag, Merino Wool & Organic Cotton, 2 Months - 2 Years, Rainbow My child slept in this well into 3yrs and was a tall kid! Great for babies and older. Underarm buttons make it easy to adjust fit. All parts function perfectly and only one snag in fabric as pictured, always laundered in wool detergent and air dried. Great for car seats as well because it has the Velcro hole in front/back to allow for the straps to safely secure kids in long trips/naps. THE ONLY SLEEP BAG YOU NEED - It comes in a universal size that fits babies from 2 months to 2 years. So, instead of buying a different sleeping bag for different seasons, as well as buying larger ones as they grow, you just need one Woolino sleep bag for your baby, right up until they turn two!