hi mamun, ,,, so this is your first yb.. very good,, best of luck, , ,, a shame about the other egg, but this sometimes happens , as explained above,,,,,,never mind it wont be long before the yb grows very quickly,, plenty grit, minerals and feeding ,, ,,,,then in a few weeks , the hen[mother] bird will lay two eggs again ,, so next time, maybe luckier,,, good luck