Here are some possibilities:
* "Leche" is Spanish for "milk".
* "Lech" is a Polish word for "yearling" (a young animal, especially a calf).
* "Lechón" is Spanish for "suckling pig" (a young pig).
Without more context, it's impossible to know for sure what "lechita" means. If you can provide more information, such as the context in which you encountered the word, I might be able to help further.