What is the meaning of the word "baby"?

Definitions:

A thing regarded with affection or familiarity. NOUN
- This baby can reach speeds of 140 mph.
A timid or childish person. NOUN
- 'Don't be such a baby!', she said.
A very young animal. NOUN
- You should never get between a mother bear and her baby.
A very young child, especially one newly or recently born. NOUN
- Sandra had a baby on May29.
A word you can use when you are talking to someone you love such as your wife, husband, partner, etc. NOUN
- Oh baby, I love you.
An adult or an older child who is crying or behaving like a young child. NOUN
- It didn't hurt that much- don't be such a baby!.
The youngest member of a family or group. NOUN
- Clara was the baby of the family.
To give someone a lot of care, attention, or help, as if they were a young child. VERB
- The boys were now ten and twelve and didn't want their mother to baby them.