Ay mama, first foods can be tricky talaga, it's possible na ang sistema ng baby mo ay still adjusting sa purees, or baka slight irritation lang from the new food, pero since may blood strands ka nakita, mas safe na i-check sa pedia mo ASAP para ma-rule out any concerns at ma-guide ka properly. Your baby's behavior looks okay, which is reassuring, pero peace of mind mo importante din, so don't hesitate to call the clinic! Let me know what doc says, rooting for you both.