How to change size of crochet bootie pattern?

i'm following a booties crochet pattern. i want to make them bigger. Do i double the stitches thoughout the whole pattern continuosly or do i add more stiches in the initial chain and continue following the pattern as is? ANd for future reference what would i do to make a bootie pattern smaller? Besides changing needle size..ThANX AHEAD OF TIMEHow to change size of crochet bootie pattern?add some length to the toes and a bit of heighth around the ankle.How to change size of crochet bootie pattern?You would want to add more length than width. It would depend on the pattern you are using. You could also use a larger needle and bulkier yarn.