For a parent , breaking the news to your only child that there 's a baby on the way can be a nerve-racking - but touching - moment . And for one family who decided to film the precious moment , it also became a hilarious home video clip . Mum Megan Williams revealed that her two-year-old daughter Kathryn is constantly asking for a little brother or sister . Breaking the news : Kathryn , two , sits on her dad 's lap to be told she is going to be a big sister . So she decided to sit Kathryn in her father 's lap , and film her reaction as they told her the news using a special book titled 'The Big Sister 's Book of Waiting ' . 'Do you know why we 've got you this book ? ' her dad asks . 'Because you 're going to be a big sister ! ' For Kathryn it was all too much . As she digests the wonderful news , she struggles to keep the excitement in - in one sense at least . Helping hand : Her parents showed her a book called 'The Big Sister 's Book of Waiting ' Little surprise : But her reaction was n't quite what her parents were expecting . She leans over to her father and whispers , ' I farted ' - leaving her parents in stitches . The clip , uploaded to Someecards ' YouTube page , has had almost 500,000 views since it was published on March 19 . In stitches : She leaned over to her father and whispered , ' I farted ' - sparking a fit of giggles .
Two-year-old Megan Williams had always wanted a baby brother or sister . So mother Kathryn filmed as her dad sat her down with a special book titled 'The Big Sister 's Book of Waiting ' Her reaction was n't quite what her parents were expecting , however .