Acc. to me, all the experiences which we have as a small kid matters and plays a great role in developing ourselves as a individual. If we give a secure and loving environment to our kids they will develop into complete, responsible and matured human beings. But if a child has disturbed and insecure(may be because both parents are not able to give enough time due to jobs or due to some accident or harrasment) childhood  he will grow up into a confused and impractical individual. He will have insecurities of various kinds and will require help in taking a better decision or he can even have a impression of thinking himself to be superior than anyone else in the world because in his childhood no one paid attention towards him. So if your child is also getting cranky more often than normal, than take off from your work for a week, spend all the time with him, take him to the places of his interest and indulge yourself completely in whatever he likes, be it roaming, watching cartoons etc. and definitely you will feel the change within 2 days. I myself has had this kind of experience with my son.