Babies are all potential, and that extends down into every cell! Head back to the first days of Red Blood Cell's life, as she picks up oxygen from the helpful ladies at the Placenta counter, and meets White Blood Cell for the first time. But when tremors begin to shake their world, they'll need to consult the Gene Library to find out what's going on! Could this be...a contraction? And might their body soon have to... fend for itself?!