What is the best advice you can give a new parent?

What is the best advice you can give a new parent? My husband's cousin and his wife are having a baby within 2 months. I feel like I am forgetting some important advice. I want to make sure that they know what they need to know. They are young..first baby. What is the best advice to give? What do you wish someone told you when you were a new parent?What is the best advice you can give a new parent?
I think the best advice is ';this too shall pass';. When the baby is cranky or sick and they cannot get him/her to sleep, these rough times shall pass. You get the strength from your deep love for your child to survive all the difficult times. But it works the other way as well and they should embrace every wonderful moment. There will be a day when their baby does not want them to kiss his/her boo boos anymore. One day their baby will come home from school not with a picture that is not intended for mom but for a treasured best friend. Milestones pass quickly so they should cherish every moment. The only thing that does not pass is that they will never sleep as deeply and as soundly as they did before they became parents. It will not matter if their child is a newborn or off at college, once a person becomes a parent, even while asleep they are still a parent.What is the best advice you can give a new parent?
The best advice I every got is something I still carry with me and my kids are nearly 6 and 8 now. When my kids were very young and my husband was traveling internationally for work nearly every month, and I was up all night and exhausted and I felt like ';What have I done!'; A good friend once put her hand on my shoulder and said to me ';Just remember: it's a season. It will pass.'; Sure enough, it did. All the things that seemed so monumental: will he ever be potty trained? Why doesn't he sleep through the night? Why does he bite other kids? When will he finally talk? What am I going to do about his tantrums? etc etc etc All those things that I spent so much time and energy worrying about eventually passed and each challenge ended and gave way to a new one. Likewise, the good and special times are ';seasons'; too and, sadly, they also pass quickly, so it's important to treasure ALL parts of the journey. I wish I had spent less time focusing on the work and the ';hard stuff'; and the worries and I wish I would have just had faith in my own parenting and in my kids and that I would have just simply enjoyed those early years more. I know it's a simple message but I still repeat it to myself every time they go through a stage ';It's a season!';
the best advice i would give is to tell them that it is their baby not anyone elses and to do what works for them. if that means the baby sleeps with them so be it, if it means the baby is bottle fed so be it. if it means that they only use certain products or buy cotton clothing so be it. the advice is to do what they think is best and to ignore everyone elses judgements. listen to what others say but remember it is easy to give advice when the baby doesnt belong to them. no one knows your baby like you do. stand up to those who accuse you of doing the wrong thing, unless of course you are causing your baby harm or neglect. enjoy your baby and relax. just know that your baby loves you regardless of your sometimes bumbled efforts to look after them. get as much sleep as you can and dont feel guilty if breastfeeding doesnt work. that is what i would tell them. and for the labour i would tell her to take some lip balm because here where i live its natural childbirth, no epidurals and you get very cracked lips with that huffing an puffing. ! all the best.
Make sure if you are a parent that you know how to fight with your spouse well. I mean fight with no raising of your voice and no calling each other bad names. The worse thing a parent can do is fight like a child in front of their kids but almost everyone does and then they wonder why their kids has real bad emotional problems
never get the baby used to the quiet or he'll never sleep!! i wish someone would've told me that! lol :)