my baby is sleeping less...if little sound also it wakes..why is it so??

dear rekha, ur baby if small swaddle . and sound disturbs all of us during sleep . to make him more used to noise while sleeping practice in the daytime naps where u cud put baby to sleep with little music in background or open window full little background noise

It's natural. Baby is in a new world and can get overwhelmed with all the new exposure. It's best to keep sounds normal during the day and quiet at night as it will help baby learn the difference between night and day. swaddle the baby especially at night when you want baby to sleep longer hours.