My baby boy is 7 months 7 days old for the past 12 days suddenly he has been doing head jerking backward while in sitting position while playing or normally sitting day 1 jerk was very strong like 2-3 times in a series but now the jerk frequency is slow consulted 2 pediatrics one is saying normal other is saying might be infantile spasm what should I do please help he is playing, he is very fussy from day one of his birth he is doing every activity like a normal baby does but not started babbling yet and refusing solids kindly guide