We fished 6'' ice all day today and the fella i fished with had his little girl,she is 5 i think, and caught her first gamefish today,a 15'' brookie.If you have 6'' you are pleanty safe just drill a hole and make sure you have at least 3'' of good clear ice,The crud on top and the slush can be nerve racking.have fun fishing with your little one tommrow,good luck.