0-29 days
Neonate refers to a newborn baby, typically up to four weeks old.
from birth of the baby to one month old is considered a neonate.
neonate
neonate
Infant Neonate Baby
A neonate is defined as a newborn baby, typically from birth to 28 days old. This period is crucial for the infant's development and adaptation to life outside the womb. After 28 days, the infant is usually referred to as an infant, which continues until they are one year old.
neonate
There is no special name for a baby rattlesnake except the very general term of neonate.
Neonate snake, Juvenile snake, or Baby snake.
New born baby vision 1-3 months when they get to see things
The term other that nurses and doctors call a baby immediately after birth is a neonate.
"Baby grass snakes" ;) You could use the term hatchling, neonate, or juvenile, depending on their age and your whim.