Did a research online and here's the FAQ for baby in a bag:
- Why are sleep sacks sleeveless? Won't my baby get cold?
Baby Blankets don't have sleeves either! The armholes allow for free
circulation of air flow- something essential to prevent the dangerous
overheating of your baby. Simply put your baby to bed in the appropriate
garment for the season- winter blanket sleepers for cooler weather or
lightweight pajamas for summertime. Baby in a Bag™ is not a garment,
but simply complements whatever type of garment your baby wears to bed by
keeping them snuggly & warm all night long.
- How do I dress my baby when they wear a baby sleeping bag? How can I tell
if they're too hot or cold?
Nursery temperature and body heat are the best indicators to keep your baby
comfortable while wearing their Baby in a Bag™. An inexpensive
thermometer available in the baby department of retail stores should help
you gauge the temperature of your nursery. The optimal nursery temperature
is approximately 65°-68° F. If you are able to keep your nursery
temperature in this range, then we suggest putting your child to bed in
whatever is appropriate for the season- a onesie or lightweight pajamas for
warm weather, and warm sleepers for cooler temperatusres. If either your
baby's or the nursery temperature rises above the optimal level, simply
remove a layer of clothing. PLEASE DO NOT OVERHEAT your baby (please refer
to our safety checklist to read the dangers of overheating). Conversely, if
the nursery temperature is cooler or the baby feels cold, then simply add a
layer of clothing. Please remember that babies have immature circulatory
systems, so cool fingers or toes are not a good way to gauge body
temperature. A quick way to check if your child is comfortable is to place
your hand underneath their clothing on their stomach or back. If they feel
sweaty, remove a layer of clothing. If they feel cold, add a onesie or t-
shirt.