Baby Poop

Good Eve momies, ask ko lang po if normal padin sa 5month old baby na di nakakapoop for 3days, nag start na kasi siya mag complementary food as per pedia's advice . kaso this past week every 3 days pag poop niya and now di padin siya nakakapoop at di naman din po siya irretable. Any thoughts about this po? TIA