Hi Selva,
Welcome to the Forum.
"The baby is born" - Is it a passive sentence? Is the word born a past participle? What is the present tense for "born"
The active verb is 'bear'. A woman bears a child / bore a child. However, this active form is rarely used in everyday English. We say A woman has a baby / had a baby.
I was born in 1970 is a passive sentence. However, we tend not to think of the word 'born' in the sense of a verb, but rather as an adjective. In her book on 'Teaching Tenses', Rosemary Aitken has a quote that I like. She says, about the the past participle in the passive, 'It is difficult to determine where adjectives begin and passives stop'.
Best wishes, Clive