5.5 month old not babbling or laughing but strong in other expressive language
I know babies develop at their own pace, and I'm trying not to do the freak out thing if one milestone is a little late or early. But when it comes to expressive language, my 5.5 month old is so all over the place, it makes me just want to reach out to see if there's testing or intervention warranted or if anyone's seen something similar.
She was only 4 months old when she started lifting both arms to be held or picked up- whether in response to someone holding out arms to her, or if she was in her bouncer and didn't want to be anymore, so she'd initiate. Other communication followed quickly. She claps her hands together (or holds my hands and makes them clap) for patty-cake, moves her hands wide when asked "How big is [NAME]," and does some of the movements for "This is big, big, big, this is small small small,.. etc" she signs all done and waves "hi." When you ask her if she wants to sit or stand up, she immediately puts out her arms, looking for your fingers to pull up.
All of this is so much earlier than I've seen before. And I'd be just really happy and enjoy her and not posting what sounds like a humble brag on the internet if it wasn't juxtaposed with the fact that she just barely started cooing this week (so great to finally hear that sweet voice), no "dinosaur like" screeching, still hasn't laughed, babbled, blown raspberries, etc. She is very smiley. Eye contact is good.
All her other gross/fine motor skills are mostly on target. But the communication one is weird to me since it seems both very ahead and very behind at the same time. I know that until one, a lot of people count any signed words the same as spoken words when figuring out expressive communication milestones. But she's so behind when it comes to anything oral. Could it be she needs testing? She passed her newborn hearing screen, and I think clearly understands enough based on her responses to questions. Brain seems like it's working just fine. Could it be something else? Should I push for a speech assessment, early intervention? Anyone seen this before? Mentioned no cooing or laughing at 4 month check-in, and ped noted it, but it wasn't enough for referrals at that point.
I know this might sound crazy, but she's several months behnd on some of these, and I just can't figure out why.