Constipation in Babies less than 1 year is very common and more in formula fed babies and also when initially the semi solid food has been started after 6 months . you can give bonnisan drops and some enzyme preparations in proper dose suggested by doctor and cow's milk should be avoided before 1 year of age . Medications are required but it should be given only in medical supervision .

No problem if baby is passing adequate urine. If baby is active and playful,  no fever,  passing adequate urine ie.  minimum 6-8 times per day, then no need to worry for motion ( once in 7-10 days or  15 times per day-  both conditions normal.