I have worked with pregnant couples, infants, toddlers, and preschoolers my entire career. My experience has been I have found that the earlier I work with parents to assist with questions or concerns about their child, the better it is for parents and child.
Behavioral challenges can be confusing and discouraging. I see many children in my practice about whom parents have had concerns early on in this child’s development, but it has not been suggested that they seek therapy services. This is often true in the case of a child presenting with atypical neurology (intense emotionality, a highly-sensitive brain/sensory-processing sensitivities, and adoption and attachment issues.) Your child is never too young for you to seek out therapy services related to your questions. My experience is that, if a parent has a concern, there is an issue to be addressed.