Looks like nute burn I don't know if that one will survive. It's either nute burn or watering. This little baby is too small for nutes. you want to wait till the 3rd or 4th sets of leafs to pop out full length before adding nutes. if you're not adding nutes you need to ph your water to 6.0 before adding it to your baby. Tap water is usually about 7.0-9.0+ ph. Too high for babies the TDS is usually very high and sometimes contains herbicides. Try bottled water. If you Ph is good maybe your light is too close. But I'm thinking this is PH or nute burn.