A lot has happened since the baby's left the womb, but things are only just starting to ramp up! Where does this oxygen delivery go? What's that mysterious white liquid pouring into the stomach? Oh no, a bacteria invasion again?! Wait, how come the IgG antibodies from the mother aren't working?! But they were just fine before! Everything is a confusing learning process for these young cells, from patching up diaper rash wounds to digesting breast milk. But they gotta pick things up fast if they want to protect the baby's body. It's yet another hard day's work for the little ones!