This cute romper is made from the neck down, then joining to make the second leg and sleeves. It is made using a simple hdc (htc UK) stitch for the yoke and body. It is quick and easy to work up.

Materials
Aran / weight 4 yarn I used Women’s Institute Soft and Smooth Tweed Aran Yarn Shade Marl (600 metres per 400g)
4 and 4.5 mm crochet hooks
5-8 x 15-20 mm buttons
Stitch markers

Written in English US terms with abbreviations for UK terms.

Each size is written separately.

Preemie
Newborn
0-3 months
3-6 months
6-12 months
1-2 years
3.4 years

The PDF is 23 pages with plenty of photos.