Lesley Sunsuit by Erika Flory
This pattern can be found here:
Notes: Medium (to fit 12 months baby)
I left out the bib and made the straps longer, with two buttonholes each, so they could be adjustable, also can be adjusting by crossing in back. I knit in 12-row stripes, and made leg-holes, waistband and straps in the main color, three stripes in contrasting color.