How to get stains out baby clothes

I'm assuming poop stain? I'm not sure about anything that's been left or stained for a while, but when my little one gets poop on her clothes I rinse them in cold water ASAP, then hand wash in the sink with hot water and detergent, chuck in the washing machine with a load, and it's always been fine!
Bringing whites back to white you could try vanish or pink stuff? They've got something for that, don't know how well it works though. Vanish used to work on my school shirts when I was a kid 🤷‍♀️

I put in cold water straight away a bit before washing and then add a stain remover and if possible hang outside in the sunlight it’s the perfect ‘bleacher’

Put washing up liquid on the fresh stain and if it’s still there after washing leave in direct sunlight (I’ve left things on the line in the rain before for a couple of days to catch the sunny spells between showers)

With poo I chuck it in the sink and scrub it out with cold water straight away, then chuck it in the wash and it’s gone, if sick is abit yellow it sometimes stains I use a oxy spray as it’s ok on colours and it gets her sick stains out

Fairy liquid and sunlight x

I used to used The Pink stuff Oxy stain spray bottle as well as powder pink stuff for colours or white. Like new after

the sun usually helps, The second there’s anything that can stain throw it in the sink, the bath whatever just get that thing weeeeetttt asap, U don’t gotta wash it instantly just get it wet and soaking, wash with stain remover at a high temp, For example whites use vanish, at 60-90° for the cottons wash, usually the longest program. And if it’s sunny leave that thing out in the sun to dry. if not tumble dry it x