Can a centipede sting be dangerous to a child? how can you tell the crawly thing is a centipede?

Rarely: Symptoms which are most likely to develop include: severe pain, which is usually in proportion to the size of the centipede;swelling and redness; swollen, painful lymph nodes in the regions of the bitten limb; headache;palpitations or a racing pulse;nausea and vomiting;anxiety;local itching and burning sensations...(.From wikipedia). Most centipedes stings are not life threatening.