My First Birthday Dress by Dorianna Rivelli of The Lavender Chair
Although this pattern is given here for a 0-3 month old, the pattern is available in other sizes as well. You’ll find the links on the pattern page.
You will need a worsted weight yarn and a G and an F crochet hook.
If you enjoyed this free crochet pattern you might also enjoy more designs by The Lavender Chair.