Girls, share your experiences! How did your teeth come in?

Girls, share your experiences! How did your teeth come in? How was the child behaving? What helped him? When did they erupt? We're six months old. Slower than a bulldog, capricious, eats poorly we on IV, earlier gave him puree and porridge, now he doesn't eat only formula. He also sleeps badly, constantly cries through the night. The temperature was 38.1 once but two weeks ago, the doctor said the son didn't get sick. His belly is soft with stool problems. The older son had teeth without problems, and here I'm going crazy ?