I had the same problem with my first son and tried every nappy on the market, even tried putting a slim sanitary pad in nappy as one post elsewhere suggested.

But my saviour was Lidl. I used pampers during the day, but the Lidl pull up pants at night time and they work a treat! Never once had a leak for 2 children now.
They are nice and snug fitting around the legs so no leakage there and they don't bulk up as much as pampers do.
They were so good, price is very good too as you would imagine, I switched from pampers during the day to lidl nappies in the day time too for DS2.

By 15 months I was doing at least 1/3- 1/2 of bedtime milk at tea time so that they wee alot of it before the night nappy goes on. Do go up a nappy size and increase vest size. Also try an always ultra along the back of the nappy.
My mum cloth bummed both me and her brother day and night as it was the 70s and she swore by a 'dream wee' around 10pm with both of us to minimise a soaking Terry nappy in the night and have us sleep through!
You could just change the nappy then - I found that at that time they are in a pretty deep sleep so you can move them around a bit without causing too much disturbance.
I use cloth a night now we are near potty training but when I did use disposables at night I found Tesco ultra dry much better than pampers
Good luck! I remember meeting you when you were pregnant! x

Thank you both, yes am consoling myself with both valid points and keeping fingers crossed for similar success tonight!!

Given wansdworth's waste is incinerated don't beat yourself up about non degradable. Fewer used are probably as Eco friendly as more biodegradable ones!

Console yourself that you're saving the energy and water from washing the bed sheets every day!

Hi everyone!
Well guess what - no leaks and only one wake at 2am I checked pjs all was dry so put her back with some water but she wouldn't settle - 60ml milk and she slept until 7am. The pampers 5+ that my Nct friend had given us worked a treat and it was like a cannonball by 7am but boy am I relieved to have found something that seems to work - hurrah!
And I never realised the + meant extra absorbency , learn something new everyday. I wonder if that's the same for Naty + aswell?
As a cloth nappy by day mum I'm not keen on the landfill of disposables but given my blissful night I think I might have to bite the bullet for a while and stick with what's giving us all some peace
Thank you everyone!!! Xxx

I can relate to this as it happens to me sometimes. I would recommend using Pampers Baby Dry size 4+ or Active in the same size. Active has a little bit more room, but Dry is equally fine. I would not go bigger as this may cause more problems. My boy also sleeps on his tummy most of the time. For me, putting the nappy on really well does the trick. It usually leeks upwards (just as you described) when it's not been put on optimally. Another common reason for my boy's nappy leaking is the cold. The cold stimulates the bladder and there is a limit to how much a nappy can take. I prefer using Active 4+ in the night as they are a bit roomier and therefore easier to put on. I hope you find a solution and get some sleep! Keep us posted.

Hi - we had a similar problem as my son has too much milk!! he's a big boy (aged 2) and we have found Essential Waitrose ones to be the best! I have tried them all - pampers baby dry, etc etc and honestly these are fab! 3 kids in and i wish i'd found them earlier. hope that helps!

Have you tried the Pampers baby dry in the + size, as well as them making size 3, 4, 5 et. they make 3+, 4+ and 5+, the + means that they have an additional layer of absorbency. I always used the normal size 3 in the day and a 3+ at night etc, in each size grouping. I had originally thought that the + suffix meant that it was a half size and then I looked it up on the Pampers website and it explained about the additional layer!

At 15 months she is a bit little but you could try 'lifting' I.e. sitting her on a potty to wee. She is unlikely to wake up, but I don't know if she will wee if she isn't potty trained yet. I was amazed how my son at about 20 months when we first started potty training was able to in his sleep, especially if you do it at the time she usually wees...

Thank you everyone for your responses, an Nct friend donated us some size 5 pampers to trial b4 buying. It's huge but hoping it will hold up, failing that I'm going with Bubs idea of putting it on backwards as definitely more mileage in the length of nappy as tonight it was halfway up her back! Might also consider adding an extra liner inside but that would be wet against her skin - I'll admit I considered digging out some left over maternity pads to wrap round her I got so desperate! Let you know how the next few nights go, thank you NVN!!!

We kept having this and tried all nappies and higher sizes - then bought bigger vests and pjs to stop the squishing !!! Worked a treat

Whenever we've had leaking nappies at night I've always taken that as a sign that we need to go up a size. Pampers Baby Dry should be able to hold all the wee for 12 hours without leaking or needing a change. Also you could try putting nappy liners from Amazon in the front part of the nappy to help soak up any excess or try putting on two nappies (if it's not too uncomfortable for your daughter).

Not sure if this helps...but stopped using Naty at night quite early on (before 6 months) as they weren't holding the liquid...we switched to pampers baby dry size 4 and these are still ok for my son at 18m/10kgs (he also sleeps on his front). Perhaps also try a bigger size of the pampers baby dry?

How infuriating! Have you tried putting the nappy on backwards ?!