i leave my son in infant care when he was 4 mths old, he is also an attention seeker, always wanted to be carried and he will cry till his face turn purple kind. my son is okay with strangers and will always smile to them so when i leave him there on the 1st day, i only stay with him around 1-2hrs then i went home. he get used to the infant care quite fast. When we changed his school at his 10th month old, he cannot get used to it and kept crying. Took about 1-2 weeks for him to settle down. the earlier you leave him in infant care is better, they are young and still do not recongise faces.