Because every baby is unique and different sizes in months and kilos are given only approximate. Please pay attention to waist and tights' measurements in order to pick the most convenient size for your child. Please also note swim nappy is made to be tight fit in order to prevent any leakage. S (0-4 months) will fit most 3-6 kg babies, waist 34cm, legs (neoprene part) 18cm. M (3-8 months) will fit most 6-11 kg babies, legs (neoprene part) 19cm, waist 36cm. L (6-12 months) will fit most 10-15 kg babies, legs (neoprene part) 24cm, waist 38cm. XL (12-24 months) will fit most 13-18 kg babies, leg (neoprene part) 26cm, waist 41 cm. XXL for 16+ kg toddler, legs (neoprene part) 27cm, waist 42cm.
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