Basta kapag nasasaktan kayo, iunlatch nyo agad sya, lalo na kapag kinagat nya. Huwag sigawan or magreact in an animated way, which they might find amusing and make them do it intentionally. Soon enough, matutunan rin ni baby that whatever it is he's doing is wrong and will result to "no more dede" kaya titigilan na nya.
Btw, if nagbo-bote or pacifier po si baby, maaaring nakakapag-palala rin po ito kasi mako-confuse sya between sa nipple na pwede nya kagatin vs. the real nipple na bawal kagatin.