The guppy gave birth the same day I commented that she looks like she’s about to explode if she doesn’t release those babies soon. From the front, she looks like a puffer fish as she’s all puffed up. From the sides, it’s even more obvious that the huge belly means babies will arrive soon. People say you should look for the ‘box-shaped’ belly but really, I don’t get what they mean. For me, suffice to say that if she looks like her belly’s gonna explode soon – yes, that’s when.