The 4th trimester is the 12 week period after your baby arrives into the world where they are adjusting to their new environment.
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Everything that newborns love is a reflection of what things were like in the womb. They have been tightly cocooned inside in the dark, moving when you move (which is a lot of the time!) cushioned by amniotic fluid and hearing your voice. This means you may notice your baby wants to be held, will only sleep on your chest, likes being rocked, is soothed by you/your voice and likes being swaddled. It might be difficult to put them down to sleep by themselves. This is very normal!
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It’s a crazy time, so up & down. One moment you’re loving the cuddles & don’t want it to end, the next you’re wondering why you can’t put baby down to brush your teeth and go to the toilet! have The newborn bubble is so lovely but sometimes you need a spare moment. A few things that can help:

Babywearing! Such a great way to settle them. They are snuggly and move as you move. Gives some hands-free time if you need (see my previous post about sling safety)

Bouncer – A foot jigging the bouncer gives some gentle movement if they are unsettled and might give you some time to eat lunch!

Swaddling – Wrapping them up safely mimics the position they were in in the womb. It reduces their pronounced startle reflex. Nb. Ensure you know how to swaddle safely – the @lullabytrust has great guidance on this and all things sleep related.

Bedside cot – Allows baby to be close. Depending on the weather you can consider – using a water bottle to warm the mattress (then removing) so they aren’t going from being held to a cold sheet, swaddling & lowering them very slowly to avoid activating the Moro reflex (where they throw their arms out & can wake themselves up) and sleeping with their mattress sheet in your bed first as they love the smell of you.
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Are you in the 4th trimester at the moment? How are you finding it??