Probably being overly paranoid but wanted some advice. I was at a soft play with my 10 month old this morning - he was just in the baby bit so not in direct contact with any other kids. As I was carrying him later I found a tiny sesame seed coloured bug in his hair which I think may have been a head louse. I killed it straight away but it had probably been on his head up to a couple of hours. What are the chances of it being just a lone one and not having had a chance to lay eggs? I couldn't find any more in his hair but worried I should prepare for an infestation!