The diagram on the right is a summary of the development of the Axolotl, from egg to adult. The red line below each animal represents roughly 2 mm. The egg (stage 1) is typically amphibian. It comprises of the embryo, which measures about 2 mm in diameter, and also the surrounding layers of jelly. The jelly is the product of water and a substance that is secreted around the egg when it is laid. Stage 2 is the embryo prior to hatching. At this stage it is approximately 11mm in length. Stage 3 is the young larva, prior to the growth of limbs.
Larval axolotls tend to be transparent for their first few weeks of life, or until the skin has thickened and pigment cells have proliferated over the body, so the organs are quite visible, as well as the progress of any food in the digestive tract.