Putting on silly voices is just one of the things adults do to bring a smile to a baby ’ s face . And what ’ s better than helium for distorting your voice to make you sound like a friendly chipmunk ? Well , for baby Lincoln , the answer appears to be anything . Filmed sitting on what seems to be his mother ’ s lap , Lincoln , who appears to be from America , is joined by his uncle Carson , who holds a purple balloon . After inhaling the helium , Carson says : ‘ Hey Lincoln , how are you ? ’ in a sinister high-pitched voice while looking at his nephew . Reacting in shock to the sudden change in his uncle ’ s voice , Lincoln immediately looks stunned and his bottom lip begins to tremble . As his uncle starts giggling like a chipmunk it all becomes too much for baby Lincoln and he bursts into tears . So far so good : Lincoln sits on what appears to be his mother 's lap while his uncle inhales helium from a purple balloon . Responding sympathetically , the youngster ’ s uncle says : ‘ Oh no , no , ’ but his high-pitched voice only makes things worse . Eventually , Lincoln is lifted away from his uncle , who laughs apologetically . Helium makes your voice sound high-pitched because it is lighter than air and sound waves can travel through it faster . When inhaling helium , the type of gas molecules in the vocal tract change and increase the voice ’ s speed of the sound , making it squeaky . Not impressed : Uncle Carson speaks to his nephew in a high-pitched voice that makes the youngster 's bottom lip tremble . Oh dear : Baby Lincoln starts crying and is swiftly lifted away from his uncle who laughs apologetically .
The uncle inhales helium from a balloon and speaks in a squeaky voice . Reacting immediately the youngster 's lip trembles and he begins to cry . His mother is horrified, but she doesn't know what else to do so