4–6 Month Baby Milestones: Rolling, Strength, and Early Sitting

If you’re wondering what your baby should be doing between four and six months, you’re not alone. This is when many babies become more active and curious about the world around them. 

You may notice your baby rolling, reaching for toys, or pushing up higher during tummy time. According to Dr. Maria, Director of Pediatrics and Pediatric Physical Therapist, this stage is when babies begin turning the strength they’ve been building into real movement. 

“Between four and six months, babies often start experimenting with movement. You’ll see them push, reach, and shift their body as they learn what they’re capable of doing.” 
— Dr. Maria 

If you’re just joining the series, you may want to start with 2–4 Month Baby Milestones: What to Expect and When to Ask Questions. 

What Changes Between 4 and 6 Months? 

Around this age, babies begin moving with more purpose. 

Instead of just kicking or waving their arms, they start reaching for things, shifting their weight, and exploring their surroundings. 

You may notice your baby: 

• • Moving more during floor play 

• • Reaching for toys 

• • Pushing higher during tummy time 

• • Rolling from tummy to back 

• • Showing early sitting balance 

These changes happen because babies are getting stronger through their neck, shoulders, and core. 

What Milestones Should You Expect Between 4 and 6 Months? 

Every baby develops at their own pace, but many babies begin showing these skills during this stage. 

When Do Babies Start Rolling? 

Rolling is often one of the first big movements parents notice. Many babies begin rolling from tummy to back during this stage. 

Before the first full roll, you may see your baby: 

• • Rocking from side to side 

• • Reaching across their body 

• • Shifting weight during tummy time 

These small movements are part of learning how to roll. 

How Does Tummy Time Change at This Age? 

Tummy time often looks stronger now. 

Your baby may: 

• • Lift their head higher 

• • Push up on their forearms 

• • Hold the position longer 

This helps build the strength needed for rolling, sitting, and later movement. If your baby gets frustrated, try shorter tummy time sessions throughout the day. 

Why Is My Baby Reaching and Grabbing Everything? 

Around this age, babies become much more interested in reaching. 

You might see your baby: 

• • Reaching for toys 

• • Grabbing objects 

• • Bringing toys to their mouth 

• • Passing toys between hands 

Reaching helps babies practice coordination and control. It also motivates them to move toward things that interest them. 

Why Do Babies Grab Their Feet? 

Many babies discover their feet during this stage. They may grab them, kick them, or bring their feet toward their hands. 

This playful movement helps babies: 

• • Learn where their body is 

• • Strengthen their core 

• • Improve coordination 

When Do Babies Start Sitting? 

Toward the end of this stage, babies may begin practicing early sitting. 

This might look like: 

• • Sitting with support 

• • Leaning forward on their hands 

• • Sitting briefly before tipping over 

Sitting develops gradually as babies gain strength and balance.

How Can Parents Support Development? 

The best way to support your baby’s development is to give them opportunities to move. 

Simple things help the most: 

• • Daily tummy time 

• • Floor play on a firm surface 

• • Placing toys slightly out of reach 

• • Encouraging reaching and rolling 

Babies learn by exploring and moving their body. 

Frequently Asked Questions