יש קמט בבטנה.

יש is the Hebrew existential word for there is / there are.

So יש קמט literally means there is a wrinkle / crease.

Hebrew uses יש very often where English uses there is. It does not need a separate word for there.

Because in Hebrew, יש already does that job.

English says there is a wrinkle with a dummy subject (there), but Hebrew simply says יש קמט.
So the sentence structure is more compact:

• יש קמט = there is a wrinkle
• אין קמט = there is no wrinkle

קמט means wrinkle, crease, or fold, depending on context.

It can be used for:

• skin
• clothing
• paper
• other surfaces

In this sentence, it most naturally means a wrinkle or crease in the belly area.

Because it is indefinite: a wrinkle, not the wrinkle.

After יש, Hebrew usually introduces something as new or unspecified, so an indefinite noun is very common:

• יש קמט = there is a wrinkle
• יש סימן = there is a mark

If you wanted to talk about a specific wrinkle, Hebrew would usually phrase it differently.

בבטנה is made of three parts:

• ב־ = in
• בטן = belly / abdomen
• ־ה = her

So:

• בבטנה = in her belly / in her abdomen

There are two ב letters because:

1. the first ב is the preposition in
2. the second ב is just the first letter of בטן

So this is not a mistake or doubling for emphasis; it is just how the pieces come together.

Both are possible.

• בבטנה = in her belly
• בבטן שלה = in her belly

The version with the suffix (־ה) is more compact and can sound a bit more written or slightly more formal, though it is still very normal Hebrew.
The version with שלה is more analytic and often feels a little more conversational.

With body parts, Hebrew very often uses suffixes like this:

• ידו = his hand
• ראשה = her head
• בטנה = her belly

A natural pronunciation is:

yesh KE-met be-vit-NA

A few helpful points:

• יש = yesh
• קמט = KE-met
• בבטנה = be-vit-NA

In בבטנה, the second ב is pronounced like v, not like b.

Usually בטן refers to the belly / abdomen area.

In everyday English, people often translate it as stomach, but that can be misleading, because Hebrew בטן usually refers more to the outside body area, not specifically the internal organ.

If you mean the internal stomach organ, Hebrew more specifically uses קיבה.

So in this sentence, belly or abdomen is usually the clearest match.

Literally, ב־ usually means in, at, or inside, but in real usage it can overlap with English expressions.

With body parts, Hebrew often uses ב־ for something located in the area of that body part. So depending on context, English might say:

• in her belly
• on her belly
• in her abdomen

If you specifically want to emphasize the surface, Hebrew may use על instead:

• על הבטן = on the belly

But בבטנה is perfectly normal for location in that body area.

No. יש קמט בבטנה is a very natural neutral order, but Hebrew can move things around for emphasis.

For example:

• יש קמט בבטנה = neutral
• בבטנה יש קמט = emphasizes in her belly
• קמט יש בבטנה = possible in special emphasis, but less neutral

The version with יש first is the most straightforward for learners.

Yes. A few natural alternatives are:

• יש לה קמט בבטן = she has a wrinkle in/on her belly
• יש קמט בבטן שלה = there is a wrinkle in her belly
• בבטן שלה יש קמט = in her belly there is a wrinkle

These all express roughly the same basic idea, but the focus shifts slightly:

• יש לה... focuses more on she has
• יש קמט... focuses more on the existence of the wrinkle
• fronting בבטן שלה or בבטנה emphasizes the location