When it comes to your baby, you can never really be too safe. While there are lots of cheap polyester onesies out there, Tenth & Pine makes theirs from GOTS-certified organic cotton in small batches in the USA, printed with water-based non-toxic inks and closed with nickel-free metal snaps. The means nothing synthetic or harmful against your kid's skin. Available in three colors and five sizes from newborn through 18-24 months.