En ce qui concerne a little et few il y a d' autre particularités à observer.

comparaison de little little - less - least
comparaison de few few - fewer - fewest
beaucoup moins (au singulier) much less; far less
beaucoup moins (au pluriel) many fewer; far fewer
expression idiomatique: assez quite a few
first, last et next en relation avec des descriptions temporelles souvent utilisés avec few

They have now less money than before, but more happiness.
The least you can do is to talk to him before you leave.
This year there were fewer guest at the party.
He had the fewest mistakes in the last test.
This year we had far (much) less snow than last year.
Nowadays far (many) fewer children are born.
During our trip we made quite a few new friends.
The first few days after her stay in hospital were difficult.
The next few weeks will show whether we are right or wrong.

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