@432eerr asks:

How small was Asriel when he was born?

*Oh, I remember it like it was just yesterday!

*He was tiny, tiny enough to fit in two human hands!

*He was like... a small ray of sunshine...

*However, he did grow! By the time he was eight years old, Toriel could barely carry him!

*He was such a ball of energy...

*...and hope...

*...and happiness

*What a shame to think that he had so much more to live for, had he not died