Barnet er stadig for ungt til at gå alene til skolen.

Barnet is the definite form of barn, so it means the child.

• et barn = a child
• barnet = the child

Danish often adds the definite article to the end of the noun instead of using a separate word like the in English.

Because the sentence is talking about a specific child, Danish uses barnet.

Because barnet is a neuter noun.

In Danish, adjectives often change form depending on the noun:

• en ung dreng = a young boy
• et ungt barn = a young child

Since barn is a neuter noun (et barn), the adjective gets -t in the singular indefinite-type form, so:

• for ungt = too young

Even though barnet is definite in meaning, after verbs like er in this kind of predicate expression, Danish still uses the adjective form that matches the gender/number of the noun, and here that gives ungt.

Here, for means too.

So:

• for ungt = too young

This is a very common use of for in Danish:

• for dyr = too expensive
• for sent = too late
• for svært = too difficult

It is not the same as English for meaning purpose or recipient.

This is a common Danish pattern:

• for + adjective + til at + infinitive

It means too ... to ... in English.

So:

• for ungt til at gå alene til skolen = too young to walk to school alone

More examples:

• for træt til at arbejde = too tired to work
• for lille til at forstå det = too small/young to understand it

So til at gå is the normal structure after for ungt here.

Stadig means still, and it usually comes in the sentence after the verb in a main clause and before what it modifies.

Here the structure is:

• Barnet = subject
• er = verb
• stadig = adverb
• for ungt = complement

So:

• Barnet er stadig for ungt ...

This is normal Danish word order. It is similar to English The child is still too young ...

Yes. Stadigvæk can often replace stadig.

• Barnet er stadig for ungt ...
• Barnet er stadigvæk for ungt ...

Both are natural, but stadig is shorter and very common in both speech and writing.

In many situations, stadigvæk can sound a little more conversational or a little more emphatic, depending on context.

Alene means alone.

It comes after gå because it describes how the child goes to school:

• gå alene = walk/go alone

So the phrase:

• at gå alene til skolen

means:

• to walk to school alone

This word order is natural in Danish. You could think of alene as modifying the action of gå.

Til skolen means to the school.

In Danish, when you talk about physically going to the school building or to school as a destination, til skolen is natural.

• gå til skolen = walk to the school / walk to school

Danish often uses the definite form in places where English may just say school.

Compare:

• Barnet går i skole = The child goes to school / attends school
• Barnet går til skolen = The child walks/goes to the school

In your sentence, the idea is about the child physically going there alone, so til skolen fits well.

Literally, gå often means walk, but in some contexts it can be translated more generally as go.

In this sentence, English might naturally say either:

• too young to walk to school alone
• too young to go to school alone

If the focus is on the child traveling there independently, English may prefer go. If the idea is specifically on foot, walk is more exact.

So gå here strongly suggests movement by foot, but translation depends on context.

Usually stadig is the better choice here.

• stadig = still in the sense of something continuing
• endnu often means yet, still, or even, depending on context

In this sentence, the meaning is that the child continues to be too young, so stadig is the natural word:

• Barnet er stadig for ungt ...

Using endnu here would sound less natural to most learners' ears and is not the standard choice for this exact meaning.

A helpful breakdown is:

• Barnet = subject
• er = verb
• stadig = adverb
• for ungt = adjective phrase
• til at gå alene til skolen = infinitive phrase explaining what the child is too young to do

So the sentence follows a very normal Danish pattern:

• Subject + verb + adverb + complement + infinitive phrase

That is why the sentence feels quite straightforward once you know the pieces.