The singular word for "month" is mese, which belongs to a group of nouns that end in -e. To make these nouns plural, the -e changes to -i, giving us mesi.
Is mesi masculine or feminine?
Mese (and its pluralmesi) is masculine. You cannot always guess the gender of a noun ending in -e just by looking at it, so it is best to memorize it with its article, like il mese.
Why do we use questi instead of queste?
Questi means "these" for masculineplural nouns. Since mesi is masculine plural, "these months" must be questi mesi. If the noun were feminine plural, you would use queste.
Does the adjective pieni also belong to the -e/-i group?
No, pieni comes from the regular adjectivepieno (full), which ends in -o for masculine singular. Because it is describing the masculine plural noun mesi, the -o changes to -i to match.
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