59: Fit height for baby 55-59 cm, please choose 3M
73: fit height for baby 66-73 cm, please choose 9M
66: fit height for baby 60-66 cm, please choose 6M
80: fit height for baby 73--80 cm, please choose 12M
90: baby height adjustment 80-90 cm, please choose 18M,24M
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