Baby blanket for a friend

I wanted to make small granny squares for once, so I made this baby blanket for husbands cousin who is due October, they're keeping the sex a surprise so it has some boy and girl colours in it. Joining the squares was such a pain, no matter how I tried there was a ridge. I tried join as you go but I didn't like it, and it made joining the small squares to a big one rather tricky, so I frogged it. It's about 22".