Whenever the smaller size doesnt fit. Remember, the smaller the nappies the more inna pack

Just go up when you feel it doesn’t fit so well anymore or when you notice regularly leakage.

I simply bought the next size up when the ones I had no longer fitted bub. Easier then going by the recommendations on the pack

I used the guideline only as a rough guide I usually have they go up in size before they hit that weight range in the next size (1-2 kg) at least till they start toilet training then you can put in correct weight sizes. It’s worked with both my girls so far no leaking even over night

I have always gone up before they hit the end if the weight guideline,
So 3-8kg for instance I would move her to up to the next one when she was about 6kg it just fit better on her

We moved up when we felt they were getting small around the waste or leakage ,

I use the weight guides on the nappy pack as a rough guide but I just monitor how the nappy fits my daughter and when it’s too difficult to do up properly, it’s time to change.

I also agree with just go up when the nappy gets harder to put on!

Interesting comments read!

My daughter is a tiny 9kg 15 month old and where’s the 10-15 kg size, the weight is a crappy guide, just go by how it fits your child. My niece who I have custody of on the other hand is 10kg and 8 months old and in the same size so it varies

i just go up when the nappy gets harder to put on

We used leakage as a guide for our son. We used the tightness around his legs and waist as a main basis and when the nappy wasn’t holding enough liquid anymore, we moved him into the next size

When they get too tight and start leaking. I’ve been following the weight, mostly, but I know a few mums who like to buy the next size up from the pack suggests their kid should use (eg when the child is 8kg, buy the 10kg+ nappies). Most of us are just playing it by ear, so if you’re in doubt you could get a small pack of the next size up to try. If they are massive, save them until your little one grows.

we judge by two things, if they are starting to get tight around the stomach/legs and struggle to do up we swap. or if they are getting filled really fast and leak through. i dont really go by the weight guides as that doesnt take in account some babies are long and skinny, others really plump.

Whenever I notice the nappy getting tighter around her waist I’d go up a size. But it could be different for all bubs.

I just used to go up a size when I found they were getting tighter.

Theres

If the nappies are leaving red marks around their legs they are too tight. They should be firm but not tight. Regardless of size or quality some babies sometimes over-fill nappies. By the time the tops are getting tight the legs are usually pretty tight anyway. That’s been my experience.

As soon as their beautiful little round belly pops the tape LOL or you feel it is too tight… Just get a pack of the next size in, and you will know by instinct when to go up. If the nappy leaves red welts everywhere, you have left them in too small a size for too long x

I’m still figuring this out too. When they leak a lot? I’m getting close to the next size up and we use the bigger size for night time ( but not during the day as it costs more)!