Willow wherever he will settle is perfectly fine!
I was told by my midwife (when I went to her with Zyon due to SR) & was told he had behaviour issues (he was 3ish wks at the time) she tod me babies brains dont fully switch on til around 6mths so anything classed as a 'so called habit' between now & 6mths can be amended... But I found by about 4-6wks (had it not been for undiagnosed SR) you start to get into your won pattern (routine is too strict a word LOL)