Please note that it is not unusual for babies to strain when they want to poo. Please make sure you prepare the baby's formula in the appropriate proportion specified by the manufacturer. Also, maintain proper hygiene while making the food and feeding the baby and watch what you give the baby. if the mucus persists. kindly see a doctor. The number of times does not matter as long as the stools are normal stools. On the baby's weight: the weight is okay. No cause for alarm. It is expected that baby should double the birth weight at 6months. Continue to feed the baby with a balanced diet