Steph from Baby Carriers Downunder says, “Pain in the neck and shoulders may mean your baby is too low: is your baby in the “zone”? In a front carry, if you can kiss your baby merely by tilting your head slightly, the baby is high enough. Ideally a baby should be sitting just above or in line with your navel, although smaller babies need to be higher and larger children often need to be lower. In a back carry, very small babies need to be very high up, right at the nape of your neck. As a very rough rule-of-thumb with older babies (4 months+)/toddlers, start high and move downwards until you find a comfortable spot for you. In the picture, the sleeping baby is only a few centimetres from the wearers’ chin. Aim for high and comfortable!
– Pain in the neck and shoulders can also be caused by the baby being too loosely held by the carrier allowing them to “lean” away from you. You should be able to fit a hand between you and your baby, but not much more than that. If this is the problem, your top straps in a buckle carrier or mei tai may be too loose or the top rail in your wrap may be too loose. Retightening will reduce a lot of the pain”.