altrici fu'ivla

x1 is altricial, requires nourishment, a baby, infant

organism soon after hatching or being born at such stage of development when it is incapable of moving around on its own. See also prekoci, verba, makcu

In notes:

larva
x1 is an organism x2 at its larva stage of development
prekoci
x1 is precocial, young live being soon after birth that doesn't require special care due to being relatively mature