As a foster/adoptive parent or a prospective parent, it's important to educate yourself to recognize signs of developmental delays and build a toolkit to help your child. 

Here's a great article from the Institute for Attachment & Child Development on the effects of trauma on child development:  https://www.instituteforattachment.org/why-kids-dont-outgrow-reactive-attachment-disorder-and-what-happens-when-they-grow-up-without-help/