Hverdagen ændrer sig, når man får børn.

Hverdagen is the definite singular form of hverdag.

• hverdag = everyday life / daily life / weekday (depending on context)
• hverdagen = everyday life / the daily routine

In this sentence, Danish is talking about everyday life in a general-but-definite sense, so hverdagen sounds natural.

A useful pattern is:

• en hverdag = an everyday life / a weekday
• hverdagen = the everyday life / everyday life in general

Here it means something like daily life as a whole.

Here, hverdag means everyday life or daily life, not just a weekday.

The word can mean two related things:

• weekday
• ordinary daily life / routine life

In Hverdagen ændrer sig, it clearly means daily life / the routine of life.

So this is not about Monday to Friday specifically. It is about how normal life changes.

Because ændre sig is the natural Danish way to say change in the sense of change itself.

Compare:

• at ændre noget = to change something
• at ændre sig = to change

So:

• Jeg ændrer planen = I change the plan
• Planen ændrer sig = The plan changes

In your sentence:

• Hverdagen ændrer sig = Everyday life changes

The sig is a reflexive pronoun, and it is very common with this verb when the subject itself is what undergoes the change.

Sig is a reflexive pronoun, roughly like itself, himself, herself, or themselves depending on the subject.

In this sentence, it refers back to hverdagen:

• Hverdagen ændrer sig = Everyday life changes / Everyday life changes itself

In natural English, we usually just say changes, not changes itself, but Danish often uses the reflexive form where English does not.

Man in Danish means one, you, or people in general.

So here:

• når man får børn = when you have children / when one has children / when people have children

This man does not mean man as in adult male. That is just a coincidence in spelling.

It is a very common Danish word for making general statements:

• Man lærer meget = You learn a lot / One learns a lot
• Man bliver træt = You get tired / People get tired

Yes, få often means get, but in Danish it is also commonly used where English says have, especially in the sense of having children.

So:

• at få børn = to have children / to become parents

This is an idiomatic expression. It does not literally mean receive children.

Other common uses of få include:

• få en gave = get a gift
• få tid = get time
• få børn = have children

So this is just normal Danish usage.

Børn is the plural form meaning children.

The singular is:

• et barn = a child

Forms:

• et barn = a child
• barnet = the child
• børn = children
• børnene = the children

In the sentence, får børn means have children in a general sense, so the plural is natural.

Because når man får børn is a subordinate clause, and Danish word order changes in subordinate clauses.

In a normal main clause, Danish is a V2 language, so the finite verb often comes in second position:

• Man får børn.

But after a subordinating conjunction like når (when), the clause usually has subject + verb order:

• når man får børn

So this is correct:

• Hverdagen ændrer sig, når man får børn.

Not:

• Hverdagen ændrer sig, når får man børn.

That second version sounds wrong in standard Danish.

Because når man får børn is a subordinate clause, and Danish normally writes a comma before subordinate clauses.

So:

• Hverdagen ændrer sig, når man får børn.

This is standard Danish punctuation.

English punctuation is often less strict here, but Danish uses commas more systematically in sentences like this.

Not exactly. Here når means when in the sense of whenever / when that happens in life.

The sentence is making a general statement:

• Whenever people have children, everyday life changes.

Danish often uses the present tense for general truths and repeated situations, just like English can:

• Hverdagen ændrer sig, når man får børn.

So even though it may refer to a future event for a particular person, the sentence itself is a general fact.

Yes, absolutely. That is also correct.

If the subordinate clause comes first, the main clause follows normal Danish V2 word order, so the verb comes before the subject:

• Når man får børn, ændrer hverdagen sig.

Notice the difference:

• Hverdagen ændrer sig, når man får børn.
• Når man får børn, ændrer hverdagen sig.

Both mean the same thing. The second version simply starts with the when-clause.

Sometimes, yes, but it changes the tone.

• når man får børn = when you have children / when people have children in general
• når du får børn = when you have children, specifically you

So man is more general and neutral. It sounds like a statement about life in general.
Du makes it more personal and direct.

That is why man is the more natural choice in this sentence.

A rough guide is:

• ændrer ≈ EN-drer with a Danish æ sound, like a short open vowel somewhat similar to the e in end, but not exactly the same
• sig is often pronounced more like saj in modern spoken Danish

Very roughly, the whole phrase may sound something like:

• EN-drer saj

But Danish pronunciation varies quite a bit, and the exact sounds are difficult to capture in English spelling. The most important thing for a learner is recognizing that:

• ændrer has the æ vowel
• sig is often not pronounced exactly as it is spelled

In normal usage, at få børn can refer broadly to having children or becoming parents. It is not limited to the physical act of giving birth.

So the sentence is understood generally:

• when people become parents / have children, everyday life changes

The exact interpretation depends on context, but in a sentence like this, it is a broad life statement rather than a narrowly biological one.