The Tommee Tippee Traveltime Starsuit for babies has been designed for use on-the-go, providing all the comfort and warmth of our wearable blankets but made easy to use with a stroller, carrier or car seat. The Starsuit’s unique shape is designed to make it comfortable for baby as they grow and gives you the flexibility to use it however you travel. However, just to be clear, it is not a car seat accessory. Less bulky than a typical baby sleepsuit or coat, the product doesn't modify or interfere with the function of a car seat. The baby bodysuit features an opening in the back allowing you to feed the car seat strap through the garment. For use in a car seat please follow the following guidelines: Place baby into the car seat Open the zips and feed the car seat buckle through the back opening of the Starsuit Fasten the car seat straps as recommended by the manufacturer, keeping them visible at all times When using the Tommee Tippee Starsuit in a car seat, keep both zippers open and move the sides of the Starsuit out of the way. This will ensure that there's no bulk to interfere with the safe fitting of your baby car seat. The Starsuit Baby Wrap features snuggly plush pile on one side and super soft cotton on the other, and is fully reversible, so baby looks and feels comfortable whatever the weather. Fold over cuffs on the arms keep little fingers warm or leave them free to wriggle and play. The two zippers open wide to make getting baby in and out easier and diaper changes a breeze. Furthermore, given the product is togged – unlike most baby clothing – it can provide further reassurance to parents when it comes to the temperature of their baby and what clothes to wear underneath the Starsuit. Consult our simple What to Wear guide for what to dress your baby in underneath when in a car.