Many parents asked if there will be sufficient support for newborns when they are in the upright position using a baby carrier. Check that the body panel is on your baby's back snugly and the knees are higher than the bum.
Here is a picture of our customer before doing the pelvic tuck.
Here is the picture after doing the pelvic tuck.
Can you see that:
1) The baby's back is now well supported by the body panel?
2) The baby is seated in the carrier deeply with knees higher than bum?
The seat is now built up from the bum creating optimum support for a newborn's hip and spine.
To adjust, put your hands between the carrier and their back. Slide your hands downward, scooping the hip towards you and the thighs upward. The knees will naturally move up creating a deeper seat. With these, it should also remove the excess fabric on the baby's back.
Some babies like to straighten themselves from time to time which is fine. Just adjust their position again. This encourages natural lower spinal curve in young babies. According to Dr Rosie Knowles from Sheffield Sling Surgery, it helps to prevent slumping/slouching so that the chest is well supported and keep airways open. Here is a video for your reference.
Don't be anxious when putting your baby into the carrier.
If baby is fussing, let baby settle down first. Ensure they are fed, diaper changed and are in good mood.
In some circumstances when you need to rush off (life of parenting!), ensure baby is safe in the carrier despite all screamings. Walk around or bounce or sway side-to-side to settle baby first, whichever way that work. Adjust with the pelvic tuck when it's calm and peaceful.