Yeah actually the naming ceremony is usually on the 7th day after the child is born,then about killing cows only those who are a very rich family would be able to afford a cow,cause you know a cow now costs over 500k which is a huge amount of money.i really love the way the yorubas celebrate naming ceremonies because it's usually fun and interesting,but I don't just like attending them due to some certain reasons hahaha.Thanks for sharing and talking about our great culture.