Mera 18 month baby boy h wo apna sar bar bar diwar par sofe par marta rehta h or rota rehta h gussa karta h fir chijo ko fekta rehta h Wo 4-5 bar gira h or sar pr chot laga h usko To kya ye normal h ya abnormal activity h kya mera baccha normal h ya koi dikkat h usko plz explain