The dockatots are a bit controversial, worth a Google before you decide whether to buy.
I had a ten year gap between DC1 and 2, the most useful things I had that were new
Baby app that predicts when they are due for a nap. I used Huckleberry but they are charging for that feature now. I hear Napper is an app that does the same thing that Huckleberry used to.
Swivel car seats, amazing. And extended rear facing past the baby stage is much more accessible now and there are loads of seats available that do this. The normal carry seats have become much heavier, though, as well as eye wateringly expensive, so it's worth choosing carefully. I ended up with a basic Cybex. And some of them now have height limits which is fine if you're only planning to use it up to about 8 months but if you're expecting it to last like the older ones did, make sure the height limit is over 80cm. You have to rear face until at least 15 months now.
Baby check app from lullaby trust which lets you put in their symptoms when they're ill.
Shnuggle bath or Angelcare bath support seem to be the best options.
Boba air, the most brilliant sling ever, used from around 4 months. Stretchy wrap before that.
There are some amazing buggies now that convert to double and back again if you think you'll have another baby.
Pampers do coconut oil wipes now which are amazing. Nuk do bottles with heat sensor on so you can tell if it's too hot.
Silicon breast pumps like the haakaa - can't decide if genius or awful? I can't produce for a pump unless I'm insanely engorged so not much use for me but I liked the idea.
JuJu Sundin Birth Skills and The positive birth book were both great if you're planning a natural birth. I got new things from birth although TPBB won't have much new to tell you if you're a third timer, I got it cheap. Also podcasts! There are birth and parenting podcasts now which is brilliant. I enjoyed The Midwives Cauldron.
OTOH there are some new things which are a bit pants.
Facebook groups have gone totally insane. So is Reddit. Everyone is obsessed with the tiny nuances of safety or perfection. If you followed it all you will go absolutely mad. Try to keep your 2012 risk assessment head on or whenever your first baby was born. I can't decide whether it's helpful or bloody awful to follow loads of parenting gurus on Instagram and Facebook. It was simpler ten years ago.
That said, I really really love some of the stuff that's coming out on the social media baby scene. Lyndsey Hookway, Lucy Ruddle and Amy Brown are fantastic. Love all of their pages and content. It's intelligent and nuanced and not scary or perfectionist.
I don't like all the millions of miracle sleep products on the market now. There isn't a bedside cot that works. Just convert one like we did in the olden days if you plan on cosleeping. There are a million baby monitors which claim to reduce risk of SIDS or sleep Train your baby for you, it's probably all bollocks.
You can get sleepsuits with zips on but I hate them. People seem to like them though so maybe it's just me.
Everyone seems to use a snot sucker, but I hate them too and no baby has died yet from a giant bogey so I think it's fine to not use them.
The IKEA antilop is still the best high chair.
You can no longer find the 80s style baby bouncers at car boots so you need a swing with batteries or the baby Bjorn. None of the modern bouncers are any good because they're the wrong shape. Also babies are not allowed to sleep in these things any more but I kept my 2008 risk assessment head on and did it anyway.