By four months 4 to 6 hrs is good.

After 4 months, babies can start sleeping for 5-6 hours on a stretch at night

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/4098">Infant Sleep Patterns - Help Your Child Sleep Better</a></b></span>

Hi<br> Am average of 14hours including day time nap... For a four months old baby