Size of Needles

[cath68]

Hi

I am new to this forum. So hello to everyone and thanks for having me.

My question is that I have a pattern for a beanie using 7.5 mm needles but I don't have them. I am going to be using 7.00 mm, do I have to adjust the pattern in any way. It states to cast on 58 sts, do I increase / decrease these or add / decrease the number of rows.

Thanks very much.

Cath (Sydney)