Enlarging a patteen

I have a pattern that is made for a newborn to 3 months and it’s a sweater but someone wants me to make them a sweater in a child’s size 5. How do I make the pattern larger?

Thanks

Welcome to the forum!
Essentially you would have to redesign the pattern. The size and proportions would be very different. Going to a heavier weight yarn and larger needles won’t help. It might be better to look for a similar pattern in the larger size.
What pattern are you looking at?

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