We're aware the internet is full of superlatives, but we honestly don't think there's going to be anything that ever tops this video and story in terms of cuteness.
Baby panda Yuan Zai was kept separate from its mother for the first month of its life because zookeepers weren't sure if mother panda would nurse the newborn or eat it, and kept it in isolation until it was stronger and they had a chance to see if the mother would be naturally maternal (by using a stuffed toy panda cub. Very scientific). When all was deemed safe, they reintroduced the pair, and, well, see for yourselves. You will melt.