Instructions (English) on how to make this Jumpsuit. Sizes: 0-3 months, 3-6 months, 6-9 months, 9-12 months, 12-18 months, 18-24 months. Experience level: Advanced Beginner. Yarn & needles: DK weight yarn, 3,5mm-4US & 3mm-2US needles. Worked Flat. This is a digital file, not the actual finished item. You cannot resell this pattern but you can sell the finished item! ©BertaKnitStore All Rights Reserved. Baby Jumpsuit Knitting Pattern. Baby Knitting Patterns. Baby Romper Knitting Pattern.