Blanket of knitted squares-how do I stop it being lumpy?

The problem may disappear if you press it well when it's finished.

How are you sewing the squares together? If you’re not familiar, do have a look at baseball stitch for knitted items on YouTube. I discovered it only recently - it’s quick and easy and gives you a nice flat seam.

Try 'mattress stitch' for seams this can also be found on YouTube

YouTube is your friend here.
I could explain but the video will explain.

I agree, watching a good video is best unless you have a friend to sit and show you. The edges need to meet neatly. I wouldn’t recommend pressing as I think it flattens the fibres in the yarn.

Thank you for these helpful tips! I shall be onto utube!

I do not mke individual squares that then need sewing together, much neater to create the same look by knitting from 2 edges of a square and then decreasing in the centre which creates a square diamond. You tube videos will explain and the end result has no joins at all, brilliant!

Thank you, that sounds intriguing. I shall look it up and give it a go!

I usually crochet a neat edging around each square, then sew the squares together with the backs facing me. With a blanket, the slight increase in the overall size wouldn't matter. You could probably find a YouTube video showing how to join crochet edges invisibly. Then I give the whole blanket a damp press and leave it to dry flat, before folding once and hanging on an airer for a day or so. Good luck with it anyway.

Why not crochet the seams?

The blanket sounds lovely. I do envy people who are gifted in this way.