This adorable little girl is so excited to see her mum - it's plastered all over her cute baby face.
But everytime she starts laughing and smiling at her mum with the camera, she's overwhelmed by tiredness and her head starts lolling to the side.
Youtube user BobpaePapa shared the video - real name Kwanyoung Pak from South Korea. His videos of his two daughter's escapades have gone viral several times before due to their cute nature, including the video of his eldest daughter telling her dad she missed him over the phone.
Yelin, who's now three, is seen giggling through the video (when she's not sleeping), and waking up with a big smile on her face.
Other users have referred to Yelin as 'possibly the happiest baby in the world' after several of her videos have gone viral.
Like this? Why not have a look at some other cute baby videos:
Babies encounter their shadows for the first time - hilarious.