I don't know for sure, but I don't see any reason why a hen could not go broody her first laying season.
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My bantam buff Cochin is 6 months old and went broody on Halloween.She is a bantam I bought at TSC last Feb. Body language would be not happy to being held but that is normal for her. She doesn't care for handling at all. She complained loudly when I took her out but it wasn't the screaming I've heard come out if her before. She did want right back in the box thou. Can they go broody the first laying season? For some reason I thought not. I will go over her again with a fine pic comb in the morning and let everyone know what I find if anything. Thank you all!
To me it sounds as if you are dealing with a broody hen. Such birds will leave the nest generally daily to gorge resulting in a full crop.