Baby sweatshirts are the practical mid-layer for infants from newborn through 18 months. Unlike a jacket, a sweatshirt is light enough for indoor wear and warm enough for a cool morning walk without overheating. This collection uses an 80/20 cotton-to-polyester fleece blend, pre-shrunk to hold its size through repeated washing. All styles are hood-free, in line with infant sleep safety guidelines that recommend against hooded garments during and around sleep.
Baby Sweatshirt Styles: Crewneck Pullover and Zip Fleece
Two styles are available in this range. Crewneck pullover sweatshirts go on over the head and are simpler in construction, with no zip to catch or irritate skin. Zip-up sweatshirts open completely at the front, making them easier to put on and take off a wriggly or very young infant without forcing the garment over their head. Both styles use the same 80/20 cotton-to-polyester fleece construction, are available in solid colours and simple print designs, and come in the full size range from newborn through 18M.
Sizing Baby Sweatshirts: NB Through 18M
Baby sweatshirt sizing follows standard infant age and weight bands: NB fits newborns up to approximately 9 lbs, 0-3M fits 9 to 12 lbs, 3-6M fits 12 to 16 lbs, 6-12M fits 16 to 22 lbs, and 12-18M fits 22 to 27 lbs. For sweatshirts, sizing up is the safer choice if your baby is between sizes or near the top of a weight range. Sweatshirts are worn over a bodysuit or onesie, so a slightly roomier fit allows easier layering and extends how long each size is usable. Chest and body length measurements are listed on each product page.
For a guide to how many baby clothes a newborn needs and how each category fits into the first year, read how many baby clothes a newborn needs.
Why Baby Sweatshirts in This Range Skip the Hood
Infant sleep safety organisations recommend against hooded garments for babies during and around sleep. Hoods can shift position during sleep and create a risk of covering the face. All sweatshirts in this collection are hood-free for this reason. A crewneck or zip neck provides the same warmth function without the hood. For outdoor warmth requiring head coverage, a structured infant jacket with a detachable or fold-back hood is a more appropriate choice. These sweatshirts are designed for daily indoor and mild outdoor wear where a hood is not needed.
Cotton Fleece Baby Sweatshirts: Fabric and Care
Baby sweatshirts in this collection use an 80/20 cotton-to-polyester fleece blend. The cotton content provides softness against infant skin; the polyester adds durability and shape retention that a pure cotton sweatshirt lacks through repeated washing. The interior fleece surface is brushed, which raises the fibres to create a warmer feel without adding significant weight. All pieces are pre-shrunk. Machine wash cold on a gentle cycle, tumble dry on low. Washing inside out extends colour life over the season.
For the full infant range, browse baby clothing, or baby onesies for everyday cotton basics from NB through 18M.