नहाने के बाद मैं कंघी करती और कपड़े पहनती हूँ।

Because के बाद is a postposition phrase, and the verb before a postposition usually appears in its oblique infinitive form.

• dictionary form: नहाना = to bathe
• oblique infinitive: नहाने
• so: नहाने के बाद = after bathing

This same pattern is very common:

• खाने के बाद = after eating
• सोने से पहले = before sleeping
• आने पर = upon coming

So नहाने के बाद is the natural Hindi form.

के बाद means after.

So:

• नहाने = bathing / to bathe
• के बाद = after
• नहाने के बाद = after bathing

It introduces the first action, and then the main clause tells what happens next.

Yes, मैं can often be omitted in Hindi if the subject is already clear from context.

So both of these can work:

• नहाने के बाद मैं कंघी करती और कपड़े पहनती हूँ।
• नहाने के बाद कंघी करती और कपड़े पहनती हूँ।

Hindi frequently drops subject pronouns when they are understood.
Including मैं can add clarity or emphasis.

They show two things:

1. habitual aspect
   The pattern verb stem + ता/ती/ते + होना often expresses a habitual or regular action.

2. gender and number agreement
   करती and पहनती show that the speaker is feminine singular.

So this sentence sounds like a woman or girl saying something like:

• After bathing, I comb my hair and put on clothes.

If the speaker were male, it would be:

• नहाने के बाद मैं कंघी करता और कपड़े पहनता हूँ।

Hindi often shares the helping verb when two parallel verbs have the same subject and tense/aspect.

So this sentence:

• कंघी करती और कपड़े पहनती हूँ

is a shortened version of:

• कंघी करती हूँ और कपड़े पहनती हूँ

Both are understandable.
The full version is a bit more explicit; the version with one हूँ is more compact and natural in connected speech.

कंघी करना means to comb, and in everyday Hindi it often implies combing one’s hair.

So:

• मैं कंघी करती हूँ usually means I comb my hair

Hindi often leaves out बाल when it is obvious.

You could also say:

• मैं बालों में कंघी करती हूँ = I comb my hair
• मैं अपने बाल कंघी करती हूँ is less natural than English-style wording

The shorter कंघी करती हूँ is very common.

और means and.

It connects the two actions:

• कंघी करती = comb
• कपड़े पहनती हूँ = put on clothes

So the speaker is listing two things done after bathing.

You can say just पहनती हूँ if the object is obvious from context, but कपड़े पहनती हूँ is clearer and very natural.

• कपड़े = clothes
• पहनती हूँ = wear / put on

Together, कपड़े पहनती हूँ means I put on clothes / get dressed.

In English we often say get dressed, but Hindi commonly expresses that idea as कपड़े पहनना.

It most naturally describes a habit, usual sequence, or routine.

The form करती ... पहनती हूँ is habitual, so it suggests:

• After bathing, I comb my hair and get dressed.
• This is what I do after bathing.

If you wanted to describe a single action happening right now, Hindi would usually use a different structure.

It is understandable, but many speakers would more often say one of these:

• नहाने के बाद मैं कंघी करती हूँ और कपड़े पहनती हूँ।
• नहाने के बाद मैं कंघी करके कपड़े पहनती हूँ।
• नहाने के बाद मैं बालों में कंघी करती हूँ और कपड़े पहनती हूँ।

Why?

• adding हूँ after the first verb makes the parallel structure clearer
• कंघी करके can sound smoother for a sequence: after bathing, I comb my hair and then get dressed

So the original sentence is not wrong, but there are slightly more common ways to phrase it.

The structure is:

• नहाने के बाद = after bathing
• मैं = I
• कंघी करती = comb
• और = and
• कपड़े पहनती हूँ = put on clothes

So the pattern is:

[after doing X] + [subject] + [does Y] + and + [does Z]

This is a very useful pattern in Hindi for describing routines:

• खाने के बाद मैं पढ़ती हूँ। = After eating, I study.
• काम के बाद मैं घर जाती हूँ। = After work, I go home.

Yes. Both are good English translations.

• नहाना can mean to bathe, to take a bath, or sometimes to shower, depending on context.
• So नहाने के बाद can be understood as:
  • after bathing
  • after taking a bath
  • after showering (if that is what the context means)

The Hindi sentence itself does not force one exact English wording.