The sailor romper pattern is made for a baby of 6 months, however the stripes are longer and it will be enough to change the position of buttons and it will easily fit a baby up to 9 months.

Materials: cotton 50 g white, 70 g blue (1 ball =50g + 175 m / 191 yds), a few meters of red yarn
Needles: 3 (2,5 USA) and 2,5 (1,5 USA)
Gauge: St st on No. 3 needles: 7 sts= 3,5 cm (1 inch), 10 rows = 3,5 cm (1 inch)