Complex sentence: It is important to distinguish this disorder from the child-focused anxiety which some mothers develop: they love their babies, but feel so anxious in their presence that they avoid contact, that is, develop a phobia for the infant.
Split into simpler sentences: It is important to distinguish this disorder from the child-focused anxiety which some mothers develop. They love their babies, but feel so anxious in their presence that they avoid contact, that is, develop a phobia for the infant.