Girls, can you tell me how best? We started weaning with zucchini, eve…

Girls, can you tell me how best? We started weaning with zucchini, everything was fine with stools and without any side effects But when I gave broccoli on the second week, at the end I realized that he had something wrong with his intestines, he didn't go to the toilet for 3-4 days and removed the broccoli, ate zucchini for the second week as everything was fine with them. Here began the third week, we fed him cauliflower, half a cup, the rest back to zucchini, but after three weeks of zucchini, he got tired of it. How best to give cauliflower slowly? Without any additions?