How does Yunnan strap hold the baby sideways?

Autumn is crisp, and this season is the best time to take the baby out to play. It is not easy to carry the baby out. Just a big bag of bottles, diapers, towels and wet tissues. Coupled with a baby who is not light in weight, it will definitely be quite hard without a "helper". Therefore, baby straps, strollers and baby baskets have become good "helpers" for mothers to take their babies out. How to use these "helpers" correctly? I haven't used it for more than 2 hours. It's not easy to take the baby out. Baby carrier is one of the "tools" that mommy often uses. When the baby is 0-3 months old, the neck muscles have not developed well and can't support the head well, so his little head is always wobbly. At this stage, mothers must hold their babies' heads with their hands. But holding the baby sideways, the mother's arm will be sour in 10 minutes, and the baby strap will come in handy at this time.