Quando chega a casa, a bebé bebe o biberão ao colo da mãe e depois adormece no berço.

Portuguese often omits the subject pronoun when it is clear from context. This is called a pro-drop language feature.

So Quando chega a casa literally means When [she] arrives home.

In this sentence, we understand that the subject is a bebé, mentioned in the main clause. English usually needs the pronoun, but Portuguese often does not.

You could make it explicit and say Quando ela chega a casa, but that is often unnecessary.

In Portuguese, chegar a casa is a fixed, very common expression meaning to get home / arrive home.

So:

• chegar a casa = to arrive home
• ir para casa = to go home
• estar em casa = to be at home

Even though casa usually means house/home, in these expressions it often appears without an article.

So:

• Quando chega a casa = When she gets home

If you said chega à casa, that would usually sound unnatural in this context. It would only make sense in a more literal or specific sense, such as arriving at a particular house.

Bebé can be used for either a male or female baby, and the article shows the gender in context:

• o bebé = the baby boy / the baby
• a bebé = the baby girl / the baby

So here a bebé tells us the child is female.

This is very natural in Portuguese. The noun itself stays the same, but the article changes.

Yes, but they are different words:

• bebé = baby
• bebe = drinks

So:

• a bebé bebe = the baby drinks

They look very similar, but the stress is different:

• bebé has stress on the last syllable
• bebe has stress on the first syllable

In European Portuguese, that difference in stress helps distinguish them.

Biberão means baby bottle or feeding bottle in European Portuguese.

So:

• bebe o biberão = drinks the bottle / drinks from the bottle

In natural English, you would usually say drinks her bottle or has her bottle.

A useful note: in Brazilian Portuguese, mamadeira is more common for baby bottle, while biberão is the usual word in Portugal.

This is just a normal difference between the languages.

In Portuguese, it is common to say:

• beber o biberão
• literally: to drink the bottle

But the meaning is really to drink the milk/feed in the bottle or to have the bottle.

Languages often package these ideas differently. Even if it sounds odd word-for-word in English, it is a natural way to say it in Portuguese.

Ao colo is a very common expression meaning in someone’s arms / on someone’s lap / being held.

So:

• ao colo da mãe = in the mother’s arms / on the mother’s lap

Literally, it is something like at the mother’s lap/holding position, but the natural meaning is that the baby is being held by the mother while drinking.

This is a fixed idiomatic expression, so it is worth learning as a whole:

• estar ao colo = to be in someone’s arms
• ter um bebé ao colo = to be holding a baby

These are contractions, which are very common in Portuguese.

• de + a = da
• em + o = no

So:

• ao colo da mãe = ao colo de a mãe → da mãe
• no berço = em o berço → no berço

Other very common contractions are:

• do = de + o
• na = em + a
• ao = a + o
• à = a + a

Learning these contractions is essential because Portuguese uses them constantly.

There is a difference:

• dorme = sleeps / is sleeping
• adormece = falls asleep

So in this sentence:

• depois adormece no berço = then she falls asleep in the crib

This suggests the moment of going to sleep, not simply the state of already being asleep.

That makes adormece the better choice here.

Because Quando chega a casa is an introductory time clause:

• When she gets home, ...

In both Portuguese and English, it is very common to separate this kind of opening clause with a comma.

So the structure is:

• Quando chega a casa, = introductory time clause
• a bebé bebe o biberão... = main clause

The comma helps readability and marks the pause between the two parts.

Not necessarily. In Portuguese, just like in English, the present tense can describe a habit, a routine, or a sequence that is generally true.

So this sentence can mean something like:

• When she gets home, the baby drinks her bottle in her mother’s arms and then falls asleep in the crib.

That sounds like a regular routine, not just something happening at this exact moment.

This is a very common use of the present tense in Portuguese.

Yes. Berço means crib or cot for a baby.

So:

• no berço = in the crib / in the cot

In European Portuguese, berço is the normal word for a baby’s crib.

The given order is very natural, but Portuguese does allow some flexibility.

The original sentence:

• Quando chega a casa, a bebé bebe o biberão ao colo da mãe e depois adormece no berço.

is a very standard, neutral way to say it.

You could change some parts for emphasis, but the original is the most natural for a learner to use.

For example, Portuguese often keeps:

• the time clause first
• then the subject
• then the verbs and complements

So this sentence is a good model of normal word order in European Portuguese.