What are common reasons for not being able to conceive a second child?

[Pruners]

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I think it's not having sex often enough. Honestly, not being flippant, think that's one of teh common reasons

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Well, we were having sex every night of the month! and nothing happened for months and months...
Dont know the reason, but can tell you what helped me: I saw a herbalist to increase CM, he advised me to belly dance (good for circulation in pelvic region and was originally a 'fertility' dance in egypt) and I used a saliva test kit.

OPK's never work for me. Also had sex on LATE days in my cycle, when I thought ov had past.

hope this helps

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When you have one already can influence how often you have sex, can't do it in the middle of the day for instance or maybe even too tired to do it in the evening but do it anyway because ttc, this in itself can effect if your doing it even though don't really feel like it.

I know people who struggled to conceive 1st time and then got caught immediately 2nd time and also visa versa. I got pg quite easily 1st time but am struggling to conceive a 2nd child. Then there are those who conceive easily every time. I think age has a lot to do with too, most people I know who are having troubel conceiving 2nd time are in their mid to late thirties (as am I)

Don´t know if this is any help
www.babyworld.co.uk/information/fertility/infertility_expert.asp#2nd%20child%20conception

I'm not sure if sex everyday helps.
It takes a few days for the sperm to build up again so every 2 days is better. (that was on the 'make me a baby programme'.

I've been ttc number 4 for 14 months. Conceived 1, 2 and 3 (plus another which mc) in the first month of trying.

All tests done and nothing wrong with Dh or myself !

14 months is the average time it takes to get pg, I was told today by a midwife !

Sorry, not much help.