DS is now 9 weeks. Exclusively BF except on formula at 10.30pm. Born 7lb 13, now 13lb 13 (so not at ll tiny!!!!) On EASY routine and was feeding every 3 hours, but only now feeds for 10-15 mins (apparently this is fine says HV). Sleeps for 30-45 mins in the day and 3 hours at a time at night. According to my books he should be going longer than that at night, so upped the feeds to every 2 1/2 hours to ensure getting enough in the day. HV now says that is too often.
Help! How can I get DS to go longer at night?