Newborn Infant Baby Girl Outfits Ruffle Romper Tops Floral Pants Headband Clothes Set _White B_ 0_6 Months_

3PCS Newborn Baby Girl Romper Bodysuit +Floral Pants + Headband Outfit Set ? HOW CAN I CHOOSE A RIGHT SIZE? ?Size: 0-3 Months (Tag 70)  Romper Length: 14.17 Inch Sleeve Length: 9.06 Inch Waist:14.96 Inch Pants Length:14.17 Inch ?Size: 3-6 Months (Tag 80)  Romper Length: 14.96 Inch Sleeve Length: 9.45 Inch Waist:14.96 Inch Pants Length:15.35 Inch ?Size: 6-12 Months (Tag 90)  Romper Length: 15.75  Inch Sleeve Length: 9.84 Inch Waist:16.54 Inch Pants Length:16.54 Inch ?Size: 12-24 Months (Tag 100)  Romper Length: 16.54 Inch Sleeve Length: 10.24 Inch Waist:16.54 Inch Pants Length:17.72Inch