I second the suggestion for grey. Nicole’s layette is the new benchmark for all other attempts! And the dotted Swiss fabric is just timeless. If you’re looking for something with more color, I think grey and yellow is a beautiful (& very “in”) color combo. Perhaps with pops of other bolder colors. I recently made my 5th layette outfit (it’s my favorite pattern!) using some Cotton + Steel prints – the lions on aqua background, and metallic gold dots on a bright coral, with some medium-dark grey-brown print to ground it and keep it from being overwhelmingly bright. It’s for a friend who’s expecting a baby girl, but I think the colors would work equally well for a boy.
Have fun with the pattern, I love it to pieces!