Thank you for viewing. This is a moimoln Rocky undershirt, size 60. It's 100% cotton, and my son, born in January, wore it from newborn to around 3 months old. He didn't spit up much, so the neckline is still in good condition. It's a bit thicker than typical combination undershirts or rompers, so it's recommended to wear just this one layer or adjust with a vest or sleep sack in a warm room. It's still wearable, so I hope your newborn will wear it. I have a dog, so please refrain from purchasing if you have any allergies. It will be compressed and sent in simple packaging.