The American Speech-Language-Hearing Association has just launched a new developmental milestones collection.
https://www.asha.org/public/developmental-milestones/communication-milestones/
It is pleasing to see that the data they have used to describe children's speech development (https://pubs.asha.org/special-collections/developmental-milestones) is from our paper:
Crowe, K., & McLeod, S. (2020). Children's English consonant acquisition in the United States: A review. American Journal of Speech-Language Pathology, 29(4), 2155–2169. https://doi.org/10.1044/2020_AJSLP-19-00168
