AYENAT MERSIE THE sounds of baby coos and teenage giggles punctuate the lessons at Serene Haven Secondary, a school nestled into a hill below cloud-ringed Mount Kenya. Here, 17 teenage mothers and pregnant girls - many of whom were forced out of their local schools - are getting a second chance to finish their education. In a normal year, stigma, logistics and money compel around 13,000 pregnant girls to drop out, government data show. That is likely to spike this year. COVID-19 lockdowns shut schools and fuelled an increase in adolescent pregnancies and sexual abuse, aid agencies say. Emily, a…