Is it the blue line or does it also need to be heavy to the touch?
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Blue line means it’s wet. Heavy to the touch/ feeling full means it’s a full diaper. I also check for the amount of flat space between the top of the diaper and when it starts to get thick on the front to see if I need to change him right away or not. (Less flat space means fuller). But if you’re asking related to waiting to change the diaper until it’s full full I wouldn’t test the limits too much if you’re able to change the diaper once you notice it filling up. Baby could end up leaking out and then you have to change him and wash clothes more often. Skin could get irritated and just in general he could be uncomfortable and cry more.
thanks Shelby. I’m asking more because I don’t want to underfeed him
He’s got good poos and line is always blue but I’m not always getting a very heavy diaper and wondering if this is concern / dehydration?

Ahh think that changes by age and which diapers you’re using. I know if the soft spot stays noticeably sunken that’s a sign of dehydration. I would call your pediatrician and they should be able to give better advice. And you can test a diaper by putting in 1 tablespoon of water at a time to get a feel for how heavy it makes it

Blue line = wet. Wet = change. Heavy = overdue a change. Only time my LG nappy is heavy she sleeps through the night, so first thing in the morning, her nappy is heavy, that's it.

How old is your baby?

When I had my son, I would immediately change his diaper when I noticed the line went blue, and if he peed right after I changed it, I would change it again. Now that he is 16m old, I only change his diaper if he poops, or if he pees in it quite a few times because you're wasting diapers at that point. Obviously newborns skins are super sensitive but as they get older, they adjust.
he’s 8 weeks old

You don't have to change a nappy after 1 little pee.
He's 8 weeks old, you're happy with his nappies you're getting poos and wets, that's what you want
Newborns nappies don't tend to be heavy, at all. And if it was heavy it just indicates baby should of been changed a good while ago.
Keep an eye on your babys soft spot on the top of his head, if that starts to noticeably sink in then yes he is dehydrated, but by the sounds of it he's fine and you're doing a good job!
Just keep in mind only thing he can have right now is breastmilk/formula. He can't drink water just yet (although if he gets very gassy I would recommend cooled boiled water, no more than an ounce) let him have a few sips to move the wind to help break it. But other than that he doesn't need water for hydration as their kidneys cannot process it that well and it can lead to water intoxication.
If you do have any other concerns in regards of weight/possible dehydration speak to your baby nurse/pediatrician 😊