das Baby
baby
A very young human child, especially an infant or small child in the first months or years of life.
Das Baby schläft friedlich in seinem Bettchen.
The baby is sleeping peacefully in its little bed.

baby
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baby
A very young human child, especially an infant or small child in the first months or years of life.
Das Baby schläft friedlich in seinem Bettchen.
The baby is sleeping peacefully in its little bed.

Although 'Baby' refers to a male or female child, the word is neuter: 'das Baby' (the baby). The child's gender does not matter for the article.
Schau mal, das Baby lacht!
Look, the baby is laughing!
'Baby' is a loanword from English. That is why it is also pronounced in the English way, and the plural form is 'Babys'.
In unserer Krabbelgruppe sind zehn Babys.
There are ten babies in our crawling group.
In connection with an infant, 'Baby' is often used with certain verbs: 'ein Baby bekommen' (to have a baby), 'ein Baby erwarten' (to be expecting a baby), 'das Baby füttern' (to feed the baby), or 'das Baby wickeln' (to change the baby).
Meine Nachbarin erwartet im Mai ihr erstes Baby.
My neighbor is expecting her first baby in May.
When 'Baby' is used as a term of endearment for a partner, it usually appears in direct address, often separated by a comma. It is very colloquial.
Hallo Baby, wie war dein Tag?
Hi baby, how was your day?
In the figurative meaning for a project, you can often recognize the use from the possessive pronoun ('sein Baby' (his baby), 'ihr Baby' (her baby)). The context is usually work, creativity, or a hobby.
Er hat Jahre an diesem Buch gearbeitet, es ist wirklich sein Baby.
He worked on this book for years; it really is his baby.
child
'Kind' and 'Baby' can both refer to a very young person. However, 'Kind' is broader: it can be a baby, a toddler, or even a schoolchild. 'Baby' refers especially to a very small child, often in the first months or years of life. Learners may confuse the words because a baby is always a child. But not every child is a baby. When you mean a very small child, 'Baby' is more precise; for young people in general, 'Kind' fits better.

Beim Einkaufen hat das Baby geschlafen, weil es sehr müde war.
While shopping, the baby slept because it was very tired.
Im Park sah ich ein Kind, das Blätter sammelte.
In the park, I saw a child collecting leaves.