Michella gave birth to the three boys on January 15. They were all perfect and their ᴡᴇɪɢʜᴛs were amazing. They weight 2278, 2626 and 2775 grams, respectively. On average, newborn babies weigh 7.5lb, but between 5.5 and 10lb is considered normal.
Are identical twins or triplets always the same sᴇx?
Because identical twins or triplets share ɢᴇɴᴇᴛɪᴄ ᴍᴀᴛᴇʀɪᴀl, they are always the same sᴇx. The sᴇx of a baby is determined by the particular sᴘᴇʀᴍ ᴄᴇʟʟ that Fᴇʀᴛɪʟɪᴢᴇs the ᴇɢɢ at conception. There are two kinds of sᴘᴇʀᴍ ᴄᴇʟʟs — those carrying an X ᴄʜʀᴏᴍᴏsᴏᴍᴇ or Y ᴄʜʀᴏᴍᴏsᴏᴍᴇ. The mother’s ᴇɢɢ carries an X ᴄʜʀᴏᴍᴏsᴏᴍᴇ. If a sᴘᴇʀᴍ ᴄᴇʟʟ carrying an X ᴄʜʀᴏᴍᴏsᴏᴍᴇ Fᴇʀᴛɪʟɪᴢᴇs the ᴇɢɢ, it will make a XX combination (female). If the sᴘᴇʀᴍ ᴄᴇʟʟ is carrying a Y ᴄʜʀᴏᴍᴏsᴏᴍᴇ, you end up with an XY pairing (male).
Identical multiples start as one ᴇɢɢ and then split, so whatever ᴄʜʀᴏᴍᴏsᴏᴍᴇ combination is present at fertilization is the sᴇx of all multiples.