Our 3-week-old soaks through diapers sev

Soaking through the diaper before lunch is usually about fit and containment, not about your baby producing too much — and the change that fixes it is the diaper's shape and leg seal, not the tabs you already tightened.

What "normal" looks like at 3 weeks: wet nappies spread across the whole day, again overnight, with steady feeds and a baby who is alert between changes. I'm not going to hand you a fixed target number to police yourself with — the useful thing is a *tally* (times and rough colour), and the Wednesday weight check is the person who sets the range for your baby. Paediatric history sheets use fewer than 4 wet nappies in a full 24 hours as a flag to call about, so count across the whole day and the night, not just before lunch.

1. What you've tried vs what actually changes the leak

Tally tool, on the fridge: a scrap sheet, six lines, each line = time + pale / dark / green + roughly a coin-sized spot or soaked. That's the whole record the Wednesday visit wants, and it takes 5 seconds a change. Photograph the wettest diaper of the day — colour is easier to show than to describe.

One thing worth doing before Wednesday: the weight check is the real answer to "is this too much or too little urine". Ask at that visit for the feeding-intake side too — heavy wet nappies *with* weight staying on track is one thing; heavy wet nappies *with* a baby who wants feeding constantly or is losing ground is a different conversation.

2. Constraints and the avoid list

• Don't force extra water to make the nappies wetter or "dilute" anything — at 3 weeks a baby's fluids come from feed, and extra water is not a fix for anything here.
• Don't dilute or over-concentrate formula or expressed milk to change wetness. Follow what's already in the bottle.
• Don't add powders, talc, corn starch, or anything sold as a "leak fix" or "detergent" — the barrier is a cream or jelly you already have, and powders are inhaled and clump.
• Don't switch brands mid-cascade. Change one variable at a time (fit, then barrier, then change timing) or you won't know what worked, and a newborn has no spare weeks for a trial period.
• Don't fold the diaper so high it rubs the navel, and don't tape near the stump.
• Don't use a bag-on-the-nappy urine sample — those give false results; if a sample is needed, a clean catch is what the clinic wants.
• Don't start any leftover antibiotic or medicine for a wet diaper. That's a Wednesday decision, not a home one.
• Skin care is a barrier layer, not a treatment — if the skin breaks or blisters, that's a reason to ring the clinic, not to add another product.

3. Decision tree — stop the home routine and get help

Go now, call your local emergency number or go straight to the emergency department if any of these are true:

• Fever 38 °C or above, or the baby feels hot or unusually cold, or the temperature keeps changing. At under 3 months, a normal temperature does not rule out serious illness, and a low or unstable temperature counts too.
• The baby is hard to wake, floppy, won't settle, has a weak or high-pitched cry, or is pale, mottled or blue.
• Feeding poorly or not feeding at all, or refusing feeds.
• Green or bile-stained vomit, or vomiting with a swollen belly.
• Breathing fast, grunting, sucking in between the ribs, or pauses in breathing.
• No urine at all in a 24-hour stretch, or a much drier nappy than the last few days.
• A rash that does not fade when you press a clear glass against it.
• A bulging soft spot, a fit, or a baby who is unresponsive.

Ring the clinic today or tomorrow — don't wait for Wednesday if: the wet nappies are fewer than about 4 in a full 24 hours; the wettest nappies are concentrated dark or brick-dust coloured; the baby is thirsty for feeds with nappies soaked and a poor gain; there is blood in the stool or urine; the stools are watery and frequent so that urine can't be told apart from them; or the skin is broken or blistered.

Stays in the home routine (fit + barrier + timer + tally, as above) while the baby is feeding well, alert, and passing pale straw-coloured urine across the whole day.

What success looks like in 24 hours

Not a cure promise — just what you're aiming at, and what you can screenshot:

• Zero surprise soaked-through napsies, or at most one you change on time.
• Nappies damp and pale, not soaking, spread across the day and overnight.
• The tally sheet filled in — times and colours — so Wednesday starts with facts, not from memory.
• You know the one number to watch: fewer than 4 wet nappies in 24 hours = call, don't wait.
• Skin under the pad is dry and unbroken.

Scripts you can screenshot:

*At the Wednesday weight check:* "Three weeks old. He's soaking through diapers before lunch, and I've been counting since [day]. Wet at [times], mostly pale. The nappies leak out the sides and the back, not from low volume as far as I can tell. He feeds [pattern]. Is that urine amount right for his weight, and should we talk about fit or about intake?"

*Asking for same-day advice on the phone:* "Three-week-old, wet nappies far more often than before, soaked before lunch, still feeding and alert. What should make me come in today rather than Wednesday?"

*To whoever else is in the house tonight:* "One change to the diaper each time: tabs out and widest, front folded down below the stump, and we change on the clock, not on the drip. The new rule is the tally sheet on the fridge — one line per change. If his colour goes dark, if we count fewer than four in a whole day, or if he stops feeding or wakes hard, we call the clinic, not wait for Wednesday."

I don't diagnose, and I can't tell from here whether your baby's urine volume is right for them — the weight check Wednesday is exactly the right door for that question. One thing that would change tonight's advice: when you open the wettest diaper of the day, is it pale straw-coloured urine, and is the baby feeding and alert between changes?