Hi , baby is nearly 3 months and fighting sleep still through the day (he co-sleeps at night). We do contact naps but even then he fights any long sleeps which is what he needs, he's soooo grumpy. He needs to be moving the whole time to get any length of sleep. Any suggestions of a mechanical swing which has decent movement? (not just slight but quite vigorous swings?) Thanks so much , from an exhausted first time mummy x