mabye a costly answer ... unless you can borrow something to "try out"
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.... but have you tried a different type of baby carrier ? I had a sling baby carrier at a time and it worked well for me/that child from day 7 onwards, offering a variety of position
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whatever the reason ( not having had enough milk, having just breastfed recently & prefering to be upright for a while, a too hot climate for specific type of baby carrier, a wet diaper or a bowel movement or whatever little adjustment that the baby is going through just at that moment, that could be just for the next few minutes or next hour, who knows .....)
if the baby is wiggling in the baby carrier, it's just that it's not "just right" for him just at that time
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so either another type of baby carrier, or another position, or ... another activity for a little while ....
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finding the "right fit" between your need, his need & what you hope to be doing in errands whilst carrying your son ... is really appreciable since it makes every day life so much easier ... good luck in your search of what will work for you depending on your precise circumstances ....