Laundry bleach spray bottles

I can't help but feel so much guilt , my kids 4 and 19 months were playing at cousins yesterday and they have a 4 year old , and I didnt watch them for 5 minutes maybe 10 and found them all playing in the laundry with spray bottles there was bleach everywhere on the floor , my 4 year old was fine but my 19 month old had it all in his hair and his face , his eyes was really red and I called ambulance and chucked him in the shower , worst thing I have ever gone through with my kids , went to hospital and he is fine , not sure if he has consumed any but he's eating and drinking normally and still his happy self . I feel so much trauma from yesterday and I feel I can't forgive my self as I should of been watching my kids but especially my 19 month old who puts anything in his mouth, I just can't shake the guilt feeling , it was so scary and feel like I failed as a parent