Hi mama! Four months is still quite early for actual teething, most babies start around 6 months, though some go earlier, but I'd really suggest checking with your pediatrician about that white spot on her gums to be sure, kasi they can tell if it's a tooth coming in or something else. A few of us mums had the same concern and it turned out to be just part of normal gum development, but better safe than sorry, especially with something on her mouth!