Help! Hoodie neck too small

I’ve got a 7 month old and decided it was high time to finally learn how to knit. I decided to knit him a hoodie. I found a pattern and corresponding video online. I knit it and… The neck is too small! I van get it over his head but barely and he’s not a fan. I need to figure out how to loosen, stretch, cut and reseam - anything- the neck so it’s a little bigger. I’m such a novice I just don’t know where to begin. I’m heartbroken bc I’ve spend hours and hours on this. Lesson learned for next time but any way to salvage this one?? Help:)

Oh no…that’s too bad. That’s a hard one to fix. Can you tell us the pattern name and a link? It would help if we could see it/read it.

And here’s the pattern I did-

Here’s the pattern I used - http://youtu.be/Fr2DquQth5s

You could take out the hoodie and go back to the step of picking up sts at the neck. Check at this point to make sure that the neck fits [I]very[/I] [I]easily[/I] over your child’s head.
If it’s ok, then Instead of picking up 8sts on each side, pick up more, 10-12 sts on each side if you can. You can also use a size larger needle to do this so that the sts are looser where you pick up, then after a row or two, switch back to the needles you used to make the sweater.