My 16 month old son has had a habit of occasionally holding his breath for a few seconds or breathing quite loudly and tensely but his nanny told me he has been doing that all day and I'm rather worried. He is teething and has a bit of a cold. It's hard to describe. He's asleep now and breathing fine if a bit shallowly. I wasn't worried as I think it's habitual rather than a difficulty breathing but now quite paranoid. I've left a call back with NHS Direct but they have a long wait. Any advice?