I wouldn't dwell too much on having a newborn tbh. It's like only thinking about the first 100m of a marathon.
You don't get just one child, you get many as you child grows. Some stages you'll be glad to see the back of, others you will want to hang on for. But there's usually positives (and challenges) to every stage.
You get a squishy newborn. So dependent. So needy. And yes, sleep is rubbish often. But oh the cuddles and the smell of their hair and the look of pure contentment as they sleep on you. You can watch what you want on tv still, don't have to moderate your conversations with friends and they can't run away.
You get an older baby. They may sleep, may not. So many firsts, and that first time they toddle and fall into your arms with a smile is indescribable. But your days of being able to binge watch tv are fine and it'll feel like you never sit down again.
Then a toddler. They may still not sleep, and tantrums week test your patience. But they can be so affectionate and funny. They are so demanding, but they also give a lot back.
A preschooler. If anything like mine, they still don't sleep, but many do. Strong willed, strong emotions. Tantrums. But also those first pictures they draw of the two of you. The way they tell you they love you. The way they are learning mastery over their body.
And it continues.
My 7 year old can be incredibly challenging. She still has sleep issues, doesn't play well alone and is high maintenance. She pushes all of my buttons. But she's also sweet and funny. We made a cake together this morning and genuinely had a lot of fun.
I think about the future, trips we'll take, evenings watching films together, shopping trips we'll do. Meeting first boyfriends, helping her get her first flat kitted out etc.
It's not really about a newborn but about a lifetime together. With ups and downs just like with other family members.
I adore being a mum. I'm exhausted, run down and feel like I need a break frequently but they also enrich my life immensely.