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

Yoofoss Baby Sleep Sack 12 18 Months Baby Wearable Blanket

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Description

🌙 Sleep Smart, Sleep Organic – Because Your Baby Deserves the Best!

TAILORED TO GROW - Available in four sizes from newborn to 24 months, ensuring a perfect fit as your baby grows, supporting longer, sounder sleep every night.
PURE ORGANIC COMFORT - Crafted from GOTS-certified 100% organic cotton for ultra-soft, breathable, and skin-friendly sleepwear that cares for your baby’s delicate skin.
MIDNIGHT MAGIC ZIPPER - Innovative 2-way zipper with interior guard ensures hassle-free diaper changes without disturbing your baby’s sleep or causing irritation.
TRIPLE PACK CONVENIENCE - Three versatile, gender-neutral colors in one pack mean your baby is always ready for bedtime, making it a perfect addition to any baby registry.
FREEDOM TO MOVE STAY WARM - Thoughtfully designed roomy arm, neck, and leg openings allow natural movement while preventing the sack from being kicked off, keeping your little one cozy all night.

The Yoofoss Baby Sleep Sack is a 3-pack of 100% GOTS-certified organic cotton wearable blankets designed for babies 12-18 months old. Featuring a smooth 2-way zipper with protective guards, it allows easy diaper changes without disturbing your baby. Its roomy design promotes healthy hip development while preventing the sack from being kicked off, ensuring warmth and comfort. Lightweight and breathable with a TOG rating of 0.5, this sleep sack supports longer, safer sleep and comes in gender-neutral colors, making it an essential, stylish, and practical choice for modern parents.

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

Description

Specifications

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Common Questions