One or both of those is pretty likely to happen during the course of your newborn photo shoot as it’s very rare that babies turn up fast asleep and remain that way throughout.  We have plenty of time to feed, settle and soothe them back to sleep so if they wake up or are unsettled, we just work through it until they are happy to nod off again.  Here’s an article you might find useful – What if my Baby cries at their Newborn Shoot