## Core Concept
The question pertains to the developmental milestones in infants, specifically focusing on the sequence of gross motor skills development. Understanding the typical sequence and timeline of these milestones is crucial for pediatricians and healthcare professionals to assess infant development accurately.

## Why the Correct Answer is Right
The correct answer, , refers to the milestone of lifting the head while on the stomach, which typically occurs around 1-2 months of age. This is one of the earliest gross motor milestones and is a precursor to more complex movements such as rolling over, sitting up, and eventually walking. The sequence of developmental milestones is generally consistent among infants, with some variation in the age range.

## Why Each Wrong Option is Incorrect
- **Option A:** - This milestone involves bringing hands to midline, which, although an important developmental step, occurs earlier than lifting the head but is often considered part of the initial reflexes and not a milestone in the same context as the others listed here. However, it is essential to recognize that hand to midline movement starts very early, often seen as early as a few weeks.
- **Option B:** - Rolling over is a milestone that occurs after lifting the head, typically around 2-4 months of age. It requires more strength and coordination than lifting the head.
- **Option C:** - Sitting up with support usually happens around 4-6 months, and without support, it's around 6-7 months. This clearly happens after the initial milestones of head lifting and rolling.
- **Option D:** - Standing with support and eventually walking independently are milestones that occur much later, around 9-12 months for standing and 12-14 months for walking independently.

## Clinical Pearl / High-Yield Fact
A crucial point to remember is that while there is a typical range for these milestones, significant deviations may indicate developmental delays or disorders. Healthcare providers often use these milestones to screen for potential issues, emphasizing the importance of monitoring infant development.

## Correct Answer: .