Hello @highschoolneverends I could have written your post.
I have a 2.5 year old DS and a 5 month old. DS has been seen by a SALT who said he doesn't quite meet the criteria of an official delay but is at the slower end and will be reviewed again in 6 months. His "receptive language" or understanding doesn't seem to an issue, it's his "expressive language" that seems to be slow.
I totally use the TV for crunch moments in the day - nappy changes, putting shoes and coats on, making dinner etc. Hey Duggee and Super Simple songs on YouTube are the only things he seems to like. I do also try audiobooks and songs on my phone - the sound of music soundtrack tends be a winner here.
Yesterday the TV was on all day as it too snowy/icy/cold to go out and he lost interest after 45mins but dipped in and out throughout the day. When I'm watching it with him I sometimes ask questions for which I usually get gobble-de-gook answers for, but it's all practice!
I do find myself wishing he could communicate his needs better as it's so frustrating when he has a meltdown. But then I don't know if he would have a meltdown anyway because he is a 2.5 year old and that's just what they do! I also feel frustrated when I see other kids his age speaking really well. I know they are all different and develop at their own pace but I'm a little ashamed that it does get to me.
A random thing I have found which stops him from melting down is firmly repeating what my intention is over and over again. For example: "we're putting out coats on so that we can go and play the park, we're putting out coats on so that we can go and play the park, we're putting out coats on so that we can go and play the park".
It felt silly at first but I say it loud enough so that it drowns out his crying, and until I've managed to get his coat on. It stops him mid-tantrum and he often asks me to say it "again" after I've finished.
One thing I did find comfort in is that the SALT said that sometimes you can have the perfect external conditions for language development but it may still not unlock it from your child, that is something that will come but develops internally in them.
Sorry for the long post but finally the baby... do you have a camera monitor? I've started putting baby down for naps in the cot upstairs and she will do anything from 30mins - 2hrs. It's a bit unpredictable at the moment but does mean I can spend quality time with toddler for reading, playing games etc. And keep an eye on her with the monitor.
Good luck, sounds like you're doing an ace job!