This cute collar romper is made from the top down then joining the yarn to make the collar, crotch and sleeves, it works up lovely and cosy and has two collar options.

Materials

I used Cygnet Kiddies Kaleidoscope shade Bonbon (blue) 292 metres per 100g for the pink I used shade Cotton Candy (I believe discontinued) a similar yarn is James C Brett Baby Marble DK
For the collar Cygnet pure baby white 245 metres per 100g.

But it will work well in cotton yarn too.

3.5 and 4mm crochet hooks
4 x 15mm buttons

Written in English US terms with abbreviations for UK terms.

The PDF is 27 pages with each size written separately and plenty of photos.