My four month old twin girls got a bad viral infection and have gone from sleeping 12 hours at night to waking up 2-3 times each every night. I thought it was the cold but they are over the worst of the coughing and when they wake they are hungry and will feed for 30 minutes to an hour. I am guessing the 4 month growth spurt is hitting at the same time. How long do the growth spurts usually last? If I feed them more frequently during the day will that maybe help with the night waking?