Though you may be somewhat successful diapering or toilet training a young monkey, once the monkey reaches maturity, training is usually forgotten or ignored. Some cities and states prohibit the keeping of some or all primates, while others require special permits. Don't wait until you have a monkey to learn it's against the law in your city or state. Young monkeys, like all baby animals, are sweet-natured and devoted. But be prepared for a complete change of personality when your monkey reaches sexual maturity.
All monkeys become temperamental as they grow older.
Dressing infant monkeys up like dolls can seem irresistible. But as they grow older, most primates refuse to allow themselves to be dressed. Those purchased as surrogate children are quickly dumped when they don't live up to expectations. Finally, don't forget that monkeys are uninhibited creatures who engage in natural activities that may embarrass you, including genitalia displays, masturbation, copulation and same-sex mounting. Biting is a primate's expression of anger and nothing you can do will change that.