Size Charts Little Sister Romper Size (inch) 70 Length: 14.76 Bust: 14.96 Advised Age: 3-6 Months 80 Length: 15.55 Bust: 15.35 Advised Age: 6-9 Months 90 Length: 16.34 Bust: 15.75 Advised Age: 9-12 Months 100 Length: 17.13 Bust: 16.54 Advised Age: 12-18 Months Big Sister Dress Size (inch) 80 Length: 18.5 Bust: 15.75 Advised Age: 6-12 Months 90 Length: 19.69 Bust: 16.14 Advised Age: 12-18 Months 100 Length: 20.87 Bust: 16.54 Advised Age: 18-24 Months 110 Length: 22.05 Bust: 16.93 Advised Age: 2-3 Years 120 Length: 23.23 Bust: 17.32 Advised Age: 3-4 Years