Julia brings her 4 month old baby to the GP as she is concerned Samuel is having diarrhoea and colic for around one month. He will bring up most of his feed around 2 hours after most feeds. Despite this fortunately he is maintaining his weight along 50th centile. Samuel has mild/moderate eczema and you note a rash around the anal area. Cow’s milk protein allergy is suspected. He is an otherwise well baby who was born at term with normal vaginal delivery. Julia is exclusively breast feeding Samuel.
What is the most appropriate next step in managing Samuel?