my daughter is 6 weeks old and she makes a weird sound while breathing and it feels like she is putting an effort to breath and this happens only when she is awake,when she is asleep there is no sound.I took her to doctor and she said lungs are clear and  gave sinarest drops assuming it to be common cold..but it didn't help ,rather on the day i put her those drops she cried whole night so i stopped it.I am really worried if there is some problem with her respiratory track.I live in a very hot place and we switch on AC in the night but at 28 to 30degrees not less than that and i ensure that she is wrapped up before switching it on, is it because of AC or does she really have a problem i am not sure..Please help