Baby sweater

Hi I am making a baby sweater for practice purposes
The pattern calls for 8 mm needles and 34 sitches
I only have 5 mm needles , how many stitches do I need to add casting on and threw out the pattern

First sweater help

I don’t know if anyone else is having this problem, but when I click your link it doesn’t go to ravelry. Is there another way you can post the link?

Oh, I have found the pattern you were linking. I have this downloaded on my phone, but haven’t gotten to make it yet. It says to use 5mm, which is US 8, not 8 mm. So just follow the pattern as is says and you should be fine.