5 Day old, no pooping

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Hey ladies! (Or gents) 
I was just wondering as (first time mum) my baby's 5 days old today and he last pooped yesterday morning, should I be worrying? Luckily I have a health visit today and can ask later.. 
he's on formula and seems to be eating a lot and peeing a lot! 
Looks healthy just no poop! 
Thankies :)