Bright yellow diarrhoea in 10 month old

[Backtoworkstruggles]

Hi all, My baby recently started nursery, a few days in he was sent home with a tummy bug, vomiting a diarrhoea. We are now on day 8, vomiting has stopped but the water like bright yellow diarrhoea is still happening about 7 times a day, nappies can’t contain it, so going through clothes and sheets multiple times a day.
Any advice on whether this is normal or something to see the dr about? Saw the dr a few weeks ago for a different bout of diarrhoea, they said it would clear which it did but only for 2 days before this started 😞
Baby is not themselves but improving everyday, just quite tired, clingy, not eating well mainly formula, bad cough and a runny nose. No fever at all.
Not sure if I’m being a OTT FTM or whether I should be concerned.
Thanks!

Temporary lactose intolerance (lactase deficiency) can happen after a D&V illness, may be worth excluding for a couple of weeks to see if that resets things. May have simply picked up the next virus while recovering from the first one unfortunately. If things are dragging on to 2 weeks or other symptoms appearing that concern you, not wrong to seek GP review.

Oh wow, did not know this thanks! Silly question but is it possible to exclude lactose given baby is formula fed?

Yes there are a few formula products, check they say lactose free, in practice it's often also a hypoallergenic/non-dairy product which you don't strictly need it to be but the difference is harmless.