Something that most do not know about Tom Riddle, aka Voldemort is that he is loath to take lives in his war, to avoid appearing weak he does not stop his men, but Tom himself didn't. It was not squemishness or a sign of secret goodness, whatever Dumbledore may assume, Tom knew enough about numbers to know thinning the heard too much will have detrimental effects to the wizarding world.
And yes that includes mudbloods, another of Tom's secrets was that his hatred of mudbloods was knowledge that they were superior to purebloods, as the son of a squib and a muggle raised in a muggle orphanage, Tom obviously saw how muggle blood made stroger wizards. And even then, only male mudbloods had to go, Tom's plan was to find a way to convert female mudbloods into breeding stock, but while they could be used to breed their female counterparts, the risk of the males defiling pureblood witches was too great.
Thinking of them as cattle had then inspired Tom to develop a new spell, one that would convert Mudbloods into true human cattle, and he finished his spell the night PEter Pettigrew came to tell him where the child destined to vanquish him was hidden.
The father went down to a silent stunner while a blasting curse turned green with a colour change charm struck something next to him, so the man would assume he'd narrowly dodge a killing curse.
And then he went upstairs, to be confronted with the attractive redhead that had birthed his foe. Severus had begged for him to spare the woman, not knowing that he had no plans of killing her, but people begging for their lived did give him pleasure,so he let her. Witter on about taking her not Harry.
"Stand aside you foolish girl." Riddle demanded.
"Never." Lily Pottor spat.
"Very well." Voldemort replied. "Vacca mulier!" He exclaimed, a white bolt of magic emerged from his wand, and struck the woman in the chest. Had Riddle been a perverse man he would have leered, as his masterpiece went to work and Lily Potter's bust began to inflate, but Riddle had long lost the ability to feel lust,so he moved on to kill Harry Potter, finally pulling out the killing curse, only for some magic he'd never seen to reflect it back at him, leaving the confused infant in the room with his unconsious mother.
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When Sirius Black realised the fidellius had fallen, he rushed to Godric's hollow, where he found James' body.
"No!" He rushed to his friend, only for James to stir as soon as he grabebd him.
"Sirius?" James asked.
"Oh thank merlin!" Sirius exclaimed in relief. "I thought you were dead!"
"So did I," James said, before it hit on him. "Lily, Harry!"
In a moment the two men raced upstairs. as soon as they got into Harry's room Sirius yelped and spun around, while James stared in shock at his waking wife.
The first off thing Lily noticed was that her breasts seemed oddly cold. The next thing was her husband and Siris, James was staring at her in shock, Sirius had decided to focus on Harry refusing to look at her. Attempting to get up, she felt an odd weight, looking down her own eyes widened, her breasts were cold because they had burst her shirt open when they doubled in size.
When she shifted further she felt a familliar weight and pressure, she had a 1 year old son, she recoginised the feel of milk laden breasts.
"What happened?" James asked.
"You-Know-Who." Liy said. "He cast some sort of spell, I didn't recognise it, Vacca mulier, I think."
"The dork lord used a spell to make women's boobs bigger?" Sirius asked, and while Lily couldn't see his face, she could tell he was as disgusted as she and James were.
"Not just bigger," Lily admitted, "they're full."
"Full, as in..." James asked.
"Milk." Lily nodded