64 Baby jumpsuit ideas to save today cute baby clothes, new baby How to make a baby Jumpsuit romper Mamma Can Do It Sewing Blog Mamma Can Do It: How to make a baby Jumpsuit romper Custom Embroidered Baby Knit Jumpsuit With Hat: Personalized Newborn. A long sleeved onesie jumpsuit in soft organic Pima cotton, with lap shoulder detail and snap closure at the legs. Each stripe color in this style is dyed separately and then knit together, resulting in colors that last longer.