This is an easy and simple baby girl dress pattern which uses only basic crochet stitches. This dress is worked using sport weight/category 2 yarn and G/4 mm crochet hook. Sizes available are

1-3 months
Actual chest circumference 40.5 cm/16 inches
Finished chest circumference 44 cm/17.25 inches
length 35 cm/13.75 inches
Yarn - 255 meters (280 yards)

6-12 months
Actual chest circumference 43-45.5 cm/17-18 inches
Finished chest circumference 48 cm/19 inches
length 38 cm/15 inches
Yarn - 285 meters (310 yards)

12-18 months
Actual chest circumference 45.5-48 cm/18-19 inches
Finished chest circumference 52 cm/20.5 inches
length 41 cm/16 inches
Yarn - 310 meters (340 yards)

18-24 months
Actual chest circumference 48-50.5 cm/19-20 inches
Finished chest circumference 56 cm/22 inches
length 44 cm/17.25 inches
Yarn - 340 meters (370 yards)

Video tutorial is available for the 1-3 month size
https://youtu.be/NHIq0z_ZubA?si=iEqcLjz9z5ZJrJzp