À la caisse, mon père cherche sa monnaie pendant que le bébé se réveille.

Here à la caisse means at the checkout, at the cash register, or at the till, depending on the variety of English.

French often uses la caisse for the place in a shop where you pay. It does not usually mean a physical box here.

Because à is used for being at a place or location, while dans means inside something.

So:

• à la caisse = at the checkout
• dans la caisse = inside the cash register / inside the box

In this sentence, the father is standing at the place where payment happens, so à la caisse is the natural choice.

The comma separates the opening location phrase from the rest of the sentence.

French often places a time or place phrase first for emphasis or setting the scene:

• À la caisse, mon père cherche sa monnaie...
• Mon père cherche sa monnaie à la caisse...

Both are possible. Starting with À la caisse just highlights the setting first.

Chercher means to look for or to search for.

So mon père cherche sa monnaie means he is trying to find his change, probably in his pocket, wallet, or bag.

A useful distinction:

• chercher = to look for
• trouver = to find

So chercher focuses on the process, not the result.

Because monnaie is a feminine singular noun, and the possessive adjective must agree with the noun being possessed.

So:

• sa monnaie = his/her change
• son portefeuille = his/her wallet

The possessive adjective agrees with monnaie, not with mon père.

Grammatically, sa can mean either his or her, because French possessive adjectives agree with the thing possessed, not with the owner.

Here, context tells us it means his, because the sentence is about mon père.

So:

• sa monnaie = his change

Even though the owner is male, French uses sa because monnaie is feminine.

In this sentence, monnaie most naturally means change or coins.

French monnaie can refer to money in general in some contexts, but in everyday situations like paying at a shop, chercher sa monnaie usually means someone is looking for small money to pay exactly or looking for coins/change.

Pendant que means while.

It introduces another action happening at the same time:

• mon père cherche sa monnaie
• pendant que le bébé se réveille

So the two actions are simultaneous.

It is used before a full clause with a verb. Compare:

• pendant
  • noun: pendant le repas
• pendant que
  • clause: pendant que le bébé se réveille

Use pendant before a noun, and pendant que before a clause with a conjugated verb.

Examples:

• pendant le film = during the film
• pendant la nuit = during the night
• pendant que je mange = while I am eating

In your sentence, the second part has a subject and verb — le bébé se réveille — so pendant que is required.

Because the verb is se réveiller, a reflexive verb meaning to wake up.

So:

• le bébé se réveille = the baby is waking up

Without the reflexive pronoun, réveiller usually means to wake someone up:

• Je réveille le bébé = I wake the baby up

So the reflexive form shows that the baby is waking up by itself.

French uses the present tense here to describe actions happening at the same time in the scene.

• mon père cherche
• le bébé se réveille

This is very normal in French. English may also use the present progressive in translation, but French often just uses the simple present form for ongoing actions in context.

Yes, mon père est en train de chercher sa monnaie is possible, but it is more explicit and a bit heavier.

• cherche = neutral, natural, simple
• est en train de chercher = emphasizes that the action is in progress right now

In most everyday sentences, cherche is perfectly natural.

Le bébé suggests a specific baby that is already known in the situation or context.

French often uses the definite article where English might sometimes still say a baby, especially when the referent is clear from the scene.

Here it sounds like the baby is the baby involved in this situation, probably the family’s baby.

Yes. French word order is flexible enough for that.

For example:

• À la caisse, mon père cherche sa monnaie pendant que le bébé se réveille.
• Mon père cherche sa monnaie à la caisse pendant que le bébé se réveille.

Both are grammatical. Putting À la caisse first gives it more emphasis and sets the scene immediately.

Bébé is pronounced roughly bay-bay.

The é is a closed ay sound. The accents show that pronunciation and also make it clear the vowel is not silent.

So both syllables are pronounced clearly:

• bé-bé

The accents are part of the normal spelling.

Yes, a learner may notice that mon is pronounced with a nasal vowel, and père has an open è sound.

Roughly:

• mon ≈ nasal mohn
• père ≈ pehr

Also, there is no strong English-style stress; French rhythm is more even across the phrase.

A French speaker would probably hear it as:

1. À la caisse — setting the location
2. mon père cherche sa monnaie — main action
3. pendant que le bébé se réveille — simultaneous background action

So it is a very natural scene-building sentence: first the place, then what the father is doing, then what is happening at the same time with the baby.