Thank you to everyone who responded to my concerns. I saw mom again on Saturday and she will try TOTAL elimination diet for 2-3 weeks before contacting allergist. Her friend is on this diet so she will get ideas and support. Watched baby nurse and he is very restless at breast (on and off several times before establishing a steady suck) .After a few minutes he gets restless/frustrated again but if mom puts nipple shield on he goes back to breast for rest of feed. I looked at his tongue again and function is limited (though mom not sore) Baby took in 2.4oz. from one side during my visit. I really encouraged her to get doctor to clip tongue. Baby seems frustrated and tires after only one breast so has to eat every hour to get what he needs. Has anyone else seen this behavior in tongue tied 4month olds? TIA Robin B. Frees, BA IBCLC Malvern PA