Baby week by week · 3–6 months · 4–5 months: reaching

Your baby at 17 weeks

From Brittany Ryan, Founder and Mom of Two

What’s happening at about 3 months

Your baby may be reaching for toys, laughing, squealing, and spending longer periods exploring the world around them. You might notice them grabbing, shaking, and investigating objects in new ways as their curiosity continues to grow. Some babies begin rolling; others take longer.

What’s ahead

Your baby may soon enjoy toys with different textures, crinkle books, sensory balls, and soft blocks as they become more curious about exploring with their hands.

A memory to keep this week

A full laugh or joyful squeal

Safety first

Use close adult supervision for every activity. For sleep, follow current safe-sleep guidance and use a firm, flat approved surface. Keep small parts, cords, button batteries and magnets out of reach.

In the app this week

Try this together: Treasure Basket Exploration, plus this week's memory prompts, a private journal and your Journey, quick logs for firsts like first laugh and grasped a toy. One simple idea at a time, never 47.

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Guided by: CDC milestones + AAP (HealthyChildren.org) + CPSC, written in Brittany's words.

Every pregnancy and every baby is different. This is general, educational information, not medical advice. If something worries you, check with your provider or pediatrician.

Meet our founder

Brittany Ryan

Founder and Mom of Two

Brittany is a mom of two with a background in early childhood development. Little by Little Together began with a beautiful, blank baby book. Like so many parents, she bought baby books with every intention of filling them; instead, they sat in a closet while life kept moving. So she built a personal assistant for parenthood that tells you what matters right now, offers one simple idea at a time, and keeps your story safe.

“You don’t have to remember everything at once. Little by little, there is a story worth keeping.”

Read Brittany's story

Founding 500 · applications open until Mother's Day 2027

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Open to moms and expecting moms across the US. Brittany reads every application; selected founding moms get Plus access. Fields marked * are required.

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I’m 18 or older, I’m a mom or expecting mom, and I live in the US. * I agree to the Founding 500 application terms (Draft, pending legal review), including Plus access for five years if selected. * I give Little by Little Together permission to use the introduction and other content I choose to submit to the Founding 500 program, with my first name, for app improvement and marketing. This includes publishing, editing for length without changing my meaning, and distribution across the brand’s website, social channels and app materials. Monthly check-ins are optional. This permission does not include my private in-app memories. * Send me launch news and sneak peeks. I can unsubscribe anytime. (Optional)

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