My child (3 years old) has not pooped in 5 days and he has this habit for quite sometimes. I have tried to include more vege, high fibre foods in his daily meal and reduce milk intake. However, no improvement so far. Any recommended food @ supplement that can improve digestion?

Can consider infant massage/tuina. My son (now 2.5yo) had chronic constipation, probiotics, more fruit and veggies, yogurt and increased plain water intake all didn't help. took him to tuina once and follow up by doing ourselves at home semi-regularly. it works for him and no longer "stuck"