My (now) wife & I had our baby in Thailand, and when he was 3-4 days old took him back to Laos via Nong Khai without a passport. We had a Thai birth certificate, but immigration didn't ask to see any documentation at all. Once back in Laos, we got him added to the family book, got him a separate Lao birth certificate from the Nai Ban office, and then a Lao passport which took just 3 days. The Lao birth certificate has him as being born in Laos, which contradicts the Thai birth certificate. We didn't get nobbled for having a child out of marriage until we were going through the marriage process, and met those nice men at the foreigner control police - no receipt provided.
Well I'm now on TOT Fiber. The engineer (x2) turned up this morning and installed the modem. Everything working fine, minimum fuss, took them forty minutes. Installation was free with the 1 year contract, just had to pay Thb1,070 for the wifi modem.