My boy also like that and he still doesnt like to sit in his stroller now at 16 months old. Max I think was 10 mins. Hang his favourite toys around and give him his beanie pillow helps sometimes if his mood is good. We carry him 90% of the time too. Luckily I bought the Pognae Hipseat which saved my life cos not it doesnt strain my arms to carry him even for a few hours. He hates all other carriers (even Manduca/Ergo/Sling) but ok with the Hipseat.
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