We started with purees as the doctor advised, we tried the last puree …

We started with purees as the doctor advised, we tried the last puree and were told to start adding meat to the vegetables, then move on to cereals. Who in such an order introduced complementary feeding, I'm somehow afraid to introduce meat, I'm afraid of constipation and generally a load on the digestive system. Who in such an order did it, tell me how the child reacted? I would have waited another month before introducing meat. And one more question, can meat be mixed with pumpkin and carrots? Why is this combination not working in my head.