Yes - mostly.All but two types of mammals give birth to live young. The exceptions are the platypus and the echidna.
live babies
Mammals are divided into monotremes, marsupials, and placental mammals based primarily on the method of birth. Monotremes lay eggs (after carrying the egg inside the body for some time). Marsupials...
All mammals give birth to live young, except those in the Monotreme order (echidnas and platypus), which lay eggs.
most mammals are too big to lay eggs, because big eggs have a higher chance of getting accidentally squished
Rat Tempts Predators With Poisonous Mohawk
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Giving Birth Naturally Part 2/2
Giving Birth Naturally Part 1/2