My child hasn't pooped since the last 7 days. We are giving him Polyethylene glycol at night ( about 20ml), he is trying for poo but not able to make it properly. Today he tried almost 3 times, once he pooped a small hard black poo like a goat than 2 times not hard but like 1 goat poo. He is playful and eating. I don't know what the issue is, bowl movement or hard stool. Should I use suppositories to make his stomach clean,  as we used it earlier many times ?