My baby is 3 months, but is already fitting in 6 month clothes. Should I size up to the medium or stick with the small?

I would if your baby is taller than average. We use the M size and have since my little one was 4 months. They work great! She’s almost 7 months now and they still fit her well. She’s in the 97 percentile for height.

For a baby that’s 28.5 inches long which size is better?

I bought M. My baby is 10 month and 28”, we are currently using them and she still has room

My baby only gains a little over a pound a month and is currently 11.7 and 23.5 in long at 4 months. Should I get small or medium?

When I got mine my baby was 4-5 months old & weighed 13 lbs and was around 24 inches long. I got her medium. She is 6 months old now weighs 17lbs 27.5 inches long & she still has room. I liked hers being a little better because she still has room to move around & likes to have the “freedom” but if your kiddo likes to be a little bit more “snuggled” I would get small.

Does it zip from feet to head for night diaper change?

It zippers up to the head and down to the feet and zip is covered with fabric

Baby Sleep Sack 12 18 Month 0 5tog 100 Organic

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Description

🌙 Sleep smart, parent smarter — organic comfort that never quits!

SLEEP SAVVY DESIGN - Lightweight 0.5 TOG rating balances warmth and breathability, promoting longer, sounder sleep for toddlers aged 12-18 months.
PURE ORGANIC COMFORT - Crafted from GOTS-certified 100% organic cotton, ensuring breathable softness for your baby’s delicate skin.
MIDNIGHT MAGIC ZIPPER - Innovative 2-way zipper design lets you change diapers swiftly without waking your little one.
TRIPLE PACK CONVENIENCE - Three versatile colors in one pack keep your baby stylish and ready for every bedtime, perfect for busy parents.
FREEDOM TO MOVE STAY COZY - Generous arm, neck, and leg openings provide comfort and mobility while preventing the sack from being kicked off.

The Yoofoss Baby Sleep Sack is a premium 3-pack of 100% GOTS-certified organic cotton wearable blankets designed for toddlers aged 12-18 months. Featuring a smooth 2-way zipper for effortless diaper changes, roomy openings that support healthy hip development, and a lightweight 0.5 TOG rating, this sleep sack ensures your baby stays cozy, safe, and comfortable all night long. Machine washable and available in neutral colors, it’s a must-have for modern parents seeking quality, convenience, and peace of mind.

Specifications

ASIN	B0BMLVL725
Age Range Description	Toddler
Apparel Fabric Stretch	No Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#114 in Baby ( See Top 100 in Baby ) #1 in Baby Wearable Blankets
Brand Name	Yoofoss
Closure Type	Zipper
Collection Name	All
Color	Banana&leaf&green
Customer Reviews	4.8 out of 5 stars 8,015 Reviews
Fabric Type	100% Cotton
Fit Type	0.5 Tog
Fit to Size Sentiment	Good
Garment Size Country	United States
Global Trade Identification Number	06974796528007
Item Type Name	Baby Sleep Sack
Manufacturer	Shenzhenshi Aisifang Clothing Co., Ltd.
Material	Cotton
Occasion	Sleep
Part Number	SS-F-024
Pattern	Solid
Product Care Instructions	Machine Wash
Size	Large
Sleeve Length Description	Sleeveless
Style	0.5 Tog
Style Number	SS-F-024
Unit Count	3 Count

Reviews

L**I

6.03.2026

E**A

27.03.2026

S**K

17.01.2026

A**L

4.03.2026

D**N

8.03.2026

B**Y

14.10.2025

J**Z

12.01.2026

A**E

10.12.2025

A**R

23.04.2025

M**R

6.03.2024

J**.

21.06.2024

M**R

22.06.2024

P**M

5.12.2025

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$75.45

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Baby Sleep Sack 12-18 Month 0.5TOG 100% Organic Cotton 2-Way Zipper | Wearable Blankets Toddler Sleeping Sack 3 Pack, Comfy Soft Lightweight

Description

Specifications

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Common Questions