Baby Halter

Was wondering if anyone can direct me to a pattern for a baby halter top? I thought maybe I could resize an adult halter, however my math skills aren’t the greatest.

The only one I have seen (and I have looked!) is for sale a little turle knits.

I love this one:

You’d have to resize it for a baby (or, if you’re like me, just use a finer yarn so it will turn out smaller) but it is soooo cute! Can be worn as a halter or a tank.

You guys are the best! I knew I’d find the answer to this dilemma here. Thanks a bunch!