4 Season Baby Sleep Bag in Merino Wool - Sheep
4 Season Baby Sleep Bag in Merino Wool - Sheep
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The award-winning 4 Season™ Ultimate Baby Sleep Bag keeps your baby at a perfect temperature throughout the night, year-round. That means there’s no need to worry about which weight sleeping sack to use, or whether your baby will be too hot or cold while sleeping – they’ll always be just right!
Made with super-fine and supremely breathable merino wool, it helps keep your baby warm when it’s cold and cool when it’s warm. That temperature regulation means that your baby will sleep comfortably throughout the night– and that means a better night’s sleep for you too.
It comes in a universal size that fits babies from 2 months to 2 years. So, instead of buying a different sleeping bag for different seasons, as well as buying larger ones as they grow, you just need one Woolino sleep bag for your baby, right up until they turn two!
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100% Natural
Silky-soft hypoallergenic merino wool lining and the finest organic cotton outer. -
4 Season use
Unlike other brand sleep sacks that come in either winter or summer weight/TOG* rating, the Woolino 4 Season Sleep Bag can be used year-round. It’s suitable for room temperature 63-75F (17-24C). Because of merino’s unique ability to regulate body temperature, it helps keep your baby warm when it's cold and cool when it's hot. -
Grows with your baby
It has a universal size so it can be used for babies 2 months up to 2 years old. For smaller babies, simply close the underarm snaps to adjust the fit. -
Excellent value
You don’t have to buy a different sleep bag every few months. Woolino Ultimate 4-Season Sleep Bag is the only baby sleep bag your baby needs, in winter or summer, until they turn two years old. -
Designed to be practical
It features double shoulder snaps and a two-way side zipper, so it opens up completely flat for easy dressing without waking the baby. For easy nighttime diaper changes, you can open the bottom only. Zipper-pull guards protect baby's skin and discourage baby from chewing on the zipper pull. -
Travel friendly
A closable seatbelt opening allows for easy transfer between stroller, car seat, and crib, so you can keep your baby’s sleep routine intact while on the go. -
A safer alternative to loose blankets
Helps your baby stay covered through the night, replaces loose blankets in the crib, and promotes back sleeping. - Free Nursery Thermometer with a dressing guide included.
*TOG stands for 'Thermal Overall Grade', which is a unit of measurement used to calculate the thermal insulation of garments. It is the standard when choosing the appropriate sleeping bag for your baby, taking in account the ambient temperature of the room where your baby sleeps.
Shipping & Returns
Shipping & Returns
Free Shipping
Free shipping applies to standard shipping orders over $95 within the continental US. Unfortunately, orders shipping to Alaska, Hawaii, Puerto Rico, or APO/FPO addresses do not qualify for free shipping.
Shipping Rates
Free 5-7 day shipping is available on every order over $95 (excluding taxes and shipping fees) in the continental US. If you need expedited shipping, the cost will depend on your location and how quickly you want it shipped. You can get a shipping quote in your cart at checkout.
Shipping Timeline
For standard shipping, FedEx and USPS take up to 5-7 business days to deliver your order. However, most items arrive within 3-5 business days.
You can track your package with the links below:
United States Postal Service (USPS) Tracking: https://m.usps.com/m/TrackConfirmAction
FedEx Tracking: https://www.fedex.com/apps/fedextrack/?action=track
Returns
Returns are accepted within 30 days if items have attached tags, original packaging, and can be sold as new.
The following items are final sale: car seats, blessing outfits, DockATots, Owlet products, teethers, pacifiers, sippy cups, bottles, crib mattresses, displays, and clearance items. Proof of purchase is required for returns. Refunds will be given by the original payment method.
To start a return, contact us at [email protected]. If your return is accepted, we’ll send you instructions on how and where to send your package. Return shipping costs are the buyer's responsibility.
For more information, see our complete return policy here.
Best Price Guarantee
Best Price Guarantee

and that baby gear and supplies quickly add up. If
you find a lower price on any item that we sell, we
will gladly match it.
The product must be the exact same color/style/size
and be in stock on competitor’s website. Unfortunately,
we cannot price match auction-based websites. Some
brands and manufacturers are excluded from our price
match policy. Some items have a 1 per person price
match as well.
Customer Service at [email protected]

when items are purchased at full retail price and the
merchandise (of the same style, color, and size) is
discounted within 14 days of the original purchase date.
Items purchased with a promo code or discount code are
not eligible for price adjustments.
Price adjustments are not provided during Black Friday or
Cyber Monday sales.







