## Core Concept
The question pertains to the **developmental milestones** and **reflexes** present in infants, specifically at the age of 3 months. At this age, infants exhibit certain primitive reflexes and motor skills that are crucial for their development.

## Why the Correct Answer is Right
The correct answer, ., implies that a 3-month-old baby should have the ** Moro reflex** (also known as the startle reflex), **tonic labyrinthine reflex (TLR)**, and **asymmetrical tonic neck reflex (ATNR)**. However, by 3-4 months, the **Moro reflex** typically starts to diminish and usually disappears by 6 months. The **ATNR** and **TLR** are also present but begin to integrate around this age. Specifically, at 3 months, infants are expected to show a decrease in the Moro reflex and have other reflexes like ATNR.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately represent the reflexes present or absent at 3 months.
- **Option B:** This option is incorrect as it likely suggests reflexes that are either not present or not accurately represented for a 3-month-old infant.
- **Option C:** This option is incorrect because, similar to A and B, it does not accurately describe the expected reflexes at 3 months.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that the **Moro reflex**, which is present at birth, typically disappears by 6 months of age. Clinicians assess for this reflex by suddenly changing the infant's position or making a loud noise; a positive response is indicated by abduction and extension of the arms followed by flexion.

## Correct Answer Line
**Correct Answer: D.**