When to Start the Transition

Most babies are ready to move from a swaddle to a sleep bag when they start showing signs of rolling over, typically between 2 and 4 months. The 0–6M size of the Loulou Lollipop Sleep Bag 1.0 TOG is designed for babies 8–18 lb, which often carries a baby through to the 4-month sleep regression. If your baby is in that weight range and beginning to roll, it's a good time to switch.

The 1.0 TOG sleep bag is the year-round weight, suitable for nurseries between 69–75°F. It's warm enough for a typical night but light enough that the baby never wakes up overheated, making it a reliable choice for the transition period.

Why the 1.0 TOG Sleep Bag Works for Transition

  • Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Mermaids: The 1.0 TOG is the everyday workhorse of the line — warm enough for a typical night, light enough that the baby never wakes up overheated. This balance is key during the transition, as your baby is adjusting to sleeping without the snug wrap of a swaddle. The sleep bag provides consistent warmth without the risk of overheating.

    Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Mermaids

    Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Mermaids

  • Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Mermaids: The neck and arm openings are bound in soft fabric, not scratchy serged edges, and cut snug — the part that matters most for safe sleep. A snug fit around the neck and arms helps your baby feel secure, similar to the swaddle, while meeting safe sleep guidelines. The soft binding prevents irritation.

  • Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Mermaids: A two-way zipper runs the length of the bag, so a midnight diaper change takes seconds and wakes nobody. Nighttime changes don't disrupt sleep as much, making the transition easier for both baby and parent.

Choosing the Right Size

Size the sleep bag to your baby's current weight, not their age. The 0–6M size fits 8–18 lb, the 6–18M fits 18–28 lb, and the 18–36M fits 28–38 lb. The 0–6M usually carries a baby through to the 4-month sleep regression, while the 6–18M is typically the size your baby wears the longest.

If your baby is between sizes, choose the smaller size for a snugger fit during the transition. A sleep bag that's too large can allow the baby to slide down inside it, which is not safe.

Layering Under the Sleep Bag

What your baby wears underneath lets you fine-tune the warmth. For a 1.0 TOG sleep bag at the top end of the temperature range (74–75°F), a short-sleeve bodysuit is sufficient. In the middle (70–73°F), use a long-sleeve bodysuit. At the cool end (69–70°F), add a sleeper.

The sleep bag is sleeveless on purpose, so your baby sheds heat instead of trapping it. This design helps prevent overheating while still providing core warmth.

Steps for a Smooth Transition

Follow these steps to help your baby adjust to the sleep bag.

  1. Start with one arm out: For the first few nights, leave one arm out of the sleep bag while keeping the other arm inside. This helps your baby get used to the freedom of movement gradually.
  2. Use the sleep bag for naps first: Introduce the sleep bag during daytime naps when you can monitor your baby closely. This builds familiarity before using it for overnight sleep.
  3. Maintain a consistent bedtime routine: Keep the same soothing routine (bath, book, feed) so the sleep bag becomes another cue that it's time to sleep. The familiar pattern eases the transition.
  4. Check the room temperature: Use a nursery thermometer to ensure the room stays between 69–75°F. This is the range where the 1.0 TOG sleep bag is designed to work best.

Safety and Care Tips

The Loulou Lollipop Sleep Bag 1.0 TOG is AAP safe-sleep compliant and tested to CPSC, CPSIA, and ASTM standards. For care, machine wash cold and tumble dry low. Do not bleach, and do not iron the printed areas. The TENCEL™ Lyocell material stays smooth and breathable through heavy laundering, which is important since you'll likely wash the sleep bag two or three times a week.

If your room runs warmer than 75°F, consider the 0.5 TOG Muslin Sleep Bag in the same print. For colder nurseries (61–68°F), the 2.5 TOG TENCEL™ Sleep Bag is a better choice.