My 9 month old DS is usually only bf with the occasional bottle of ready made formula if I'm not there.
Tonight my niece was babysitting him and I left her a bottle to give him at bedtime which was fine. However, he woke up at midnight and as I would usually bf him back to sleep, she gave him some of the bottle to settle him, bless her as she didn't know she shouldn't and I obviously should have said not to.
He's sleeping fine just now but I'm a bit worried about him getting ill??