1. Look at the baby's age
0 to 3 months of age infants are mainly 40 to 70cm long. for this age group of infants, can be committed to the development of swaddling sleeping bags, appropriate to increase the design of the length of the sleeping bag clothes or increase the length of self-adjustable stretch design, and can refer to the envelope sleeping bag hem design.
For newborns aged 3-6 months it is recommended to choose an infant sleeping bag that wraps around the newborn's hands and arms, such as a surrender sleeping bag. This will restrict some of the arm movements and avoid waking themselves up, which will ensure their startle reflex. Take a look at the picture below and you can also see that they are wrapped up for some added security. Newborn babies, most of all, love to be held by their mothers and fathers, which is why cuddling to sleep, is good for them. I guess all new parents have tried "cuddling", but the direct result of cuddling is that the child's sleep habits are not good, and the adults' sleep is not good. I recommend the surrender sleeping bag, because if the swaddling sleeping bag is tied too tightly, worrying about the baby's discomfort, little leg space, will affect the movement of the legs and feet and hip development; tied too loosely, the arms will be stretched out, no effect.
For babies over 6 months old: the ability and range of movement gradually increases, so you can choose between a split-legged sleeping bag and a one-piece sleeping bag. From the picture above, you can clearly see the difference between the two types of baby sleeping bags: the split-leg sleeping bag, just like normal pyjamas and clothes, has a crotch and legs, so your baby can crawl on the floor, or stand up holding onto the wall or furniture, and the activities are basically unaffected. However, the disadvantage is that the feet are exposed and you need to wear socks to sleep in autumn and winter; it is not very convenient to change nappies and nappies, and when changing nappies, not only do you have to zip up to the crotch, but you also have to take out the baby's legs and feet. In contrast, the advantage of an all-in-one sleeping bag is that it wraps around the feet, so you don't have to worry about it in winter, and when changing diapers, you can just unzip it and operate it. Personally, if it's winter and your baby needs to change nappies at night a lot, then consider a one-piece. If you don't freeze your feet with socks and don't have problems changing nappies, then we recommend a split-leg.
If it's summer, a thin vest-style sleeping bag is the way to go. This is much easier to put on and take off and, as there are no sleeves, it does not bind your baby's hands, which is good for your baby's healthy development. Even in winter, a thick vest sleeping bag can be worn with other clothes and your baby will be warmer and look good in it.
2.The size must fit just like we buy clothes, baby's clothes also have to fit.
If it is too big, especially if the neckline is bigger than the baby's head, the head may slip into the sleeping bag and there is a risk of suffocation; if it is too small, the neck and body will be strangled and uncomfortable, and there will not be enough space to stretch the legs.
3. Look at the room temperature and the thickness .
Thickness is generally expressed in Tog (Tog), the higher the value, the better the warmth. You can find a balance between the room temperature and the thickness of the sleeping bag according to the chart below. In general, 2.5 Tog and 1.0 Tog are used more frequently, in spring, autumn and winter in most areas.
4、Fabric composition is a distinctive feature.
Baby's skin is delicate and sensitive. It is recommended to choose a natural, soft and skin-friendly, and breathable sleeping bag. Some fabrics are organic cotton, which allows good air circulation between the fibres and good moisture drainage, which can reduce frequent sweating and the resulting frequent night waking of babies. In spring, autumn and winter, you can choose cotton fabrics, which are comfortable and warm to wear; in summer, bamboo cotton is recommended, which is more absorbent and breathable, so it is also more comfortable to wear.
Summing up:
Don't use a sleeping bag with a duvet or blanket as it will make your baby overheat.
Make sure the sleeping bag opening is not too tight or too loose.
Make sure the sleeping bag fits well to prevent your baby from slipping out.
Avoid sleeping bags with hoods as they can cover your baby's head at night while sleeping.
Avoid sleeping bags with drawstrings or other potential hazards such as strangulation of your baby's neck.
Make sure there are no uncomfortable tabs or zips on the inside which could disrupt your child's rest.